Process for the carbonylation of ethylenically unsaturated compounds, novel carbonylation ligands and catalyst systems incorporating such ligands

1. A bidentate ligand of formula (I)

wherein:

A and B each independently represent a direct bond or a lower alkylene linking group having from 1 to 10 carbons;

R represents a hydrocarbyl aromatic structure having at least one aromatic ring which is part of a metallocene complex and to which Q 1 and Q 2 are each linked, through B and A, respectively, on available adjacent atoms of the at least one aromatic ring;

the groups X 3 and X 4 independently represent univalent radicals of up to 30 atoms having at least one tertiary carbon atom or X 3 and X 4 together form a bivalent radical of up to 40 atoms having at least two tertiary carbon atoms wherein each said univalent or bivalent radical is joined via said at least one or two tertiary carbon atoms respectively to the respective atom Q 1 ;

the group X 1 is defined as a univalent hydrocarbyl radical of up to 30 atoms containing at least one nitrogen atom having a pKb in dilute aqueous solution at 18° C. of between 4 and 14 wherein the said at least one nitrogen atom is separated from the Q 2 atom by between 1 and 3 carbon atoms, wherein the group X 1 is selected from the group consisting of an aromatic nitrogen heterocycle having 3-14 ring atoms, aziridine, azirine, azetidine, azete, pyrrolidone, piperidine, azepane, azepine, azocane, azocine imidazolidine, pyrazolidine, imidazoline, pyrazoline, piperazine, hexahydro-pyrimidine, hexahydro-pyridazine, and pyrrolidine radicals;

the group X 2 is defined as X 1 , X 3 or X 4 or represents a univalent radical of up to 30 atoms having at least one primary, secondary or aromatic ring carbon atom wherein each said univalent radical is joined via said at least one primary, secondary or aromatic ring carbon atom(s) respectively to the respective atom Q 2 ; and

Q 1 and Q 2 each independently represent phosphorus, arsenic or antimony.

2. The bidentate ligand according to claim 1 , wherein X 2 is the same group as X 1 .

3. The bidentate ligand according to claim 1 selected from the group consisting of 1-(di-tert-butylphosphinomethyl)-2-(di-pyridin-2-yl-phosphinomethyl)ferrocene, 1-(di-tert-pentylphosphinomethyl)-2-(di-pyridin-2-yl-phosphinomethyl)ferrocene, 1-(diadamantylphosphinomethyl)-2-(di-pyridin-2-yl-phosphinomethyl)ferrocene, 1-(di-3,5-dimethyladamantylphosphinomethyl)-2-(di-pyridin-2-yl-phosphinomethyl)ferrocene, 1-(di-5-tert-butyladamantylphosphinomethyl)-2-(di-pyridin-2-yl-phosphinomethyl)ferrocene, 1-(1-adamantyl tert-butyl-phosphinomethyl)-2-(di-pyridin-2-yl-phosphinomethyl)ferrocene, 1-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one)-2-(di-pyridin-2-yl-phosphino)-1,2-dimethylferrocene, 1-(2-(phospha-adamantyl))-2-(di-pyridin-2-ylphosphino)-1,2-dimethylferrocene, 1-(dicongressylphosphinomethyl)-2-(di-pyridin-2-yl-phosphinomethyl)ferrocene, 1-(di-pyridin-2-yl-phosphinomethyl)-2,3-bis-(ditertbutylphosphinomethyl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyridin-2-yl-phosphinomethyl)-4,5-diphenylferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyridin-2-yl-phosphinomethyl)-4-phenylferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyridin-2-yl-phosphinomethyl)-1′-phenylferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyridin-2-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyridin-2-ylphosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyridin-2-ylphosphinomethyl)-1-(trimethylsilyl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyridin-2-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyridin-2-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyridin-2-yl-phosphinomethyl)-1-(2′-phenylprop-2′-yl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyridin-2-yl-phosphinomethyl)-4,5-di-t-butylferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyridin-2-yl-phosphinomethyl)-4-t butylferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyridin-2-yl-phosphinomethyl)-1′-t-butylferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyridin-2-yl-phosphinomethyl)-4,5-diphenylferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyridin-2-yl-phosphinomethyl)-4-phenylferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyridin-2-yl-phosphinomethyl)-1-phenylferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyridin-2-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyridin-2-yl-phosphinomethyl) 4-(trimethylsilyl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyridin-2-yl-phosphinomethyl)-1′-(trimethylsilyl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyridin-2-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyridin-2-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyridin-2-yl-phosphinomethyl)-1′-(2′-phenylprop-2′-yl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyridin-2-yl-phosphinomethyl)-4,5-(di-t-butyl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyridin-2-yl-phosphinomethyl)-4-t butylferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyridin-2-yl-phosphinomethyl)-1′-t-butylferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyridin-2-yl-phosphinomethyl)-4,5 diphenylferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyridin-2-yl-phosphinomethyl)-4-phenylferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyridin-2-yl-phosphinomethyl)-1′-phenylferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyridin-2-yl-phosphinomethyl)-4,5 bis-(trimethylsilyl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyridin-2-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyridin-2-yl-phosphinomethyl)-1′-(trimethylsilyl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyridin-2-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyridin-2-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyridin-2-yl-phosphinomethyl)-1′-(2′-phenylprop-2′-yl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyridin-2-yl-phosphinomethyl)-4,5-(di-t-butyl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyridin-2-yl-phosphinomethyl)-4-t butylferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyridin-2-yl-phosphinomethyl)-1′-t-butylferrocene, 1-(P,P adamantyl, t-butyl phosphinomethyl)-2-(di-pyridin-2-yl-phosphinomethyl)-4,5-diphenylferrocene, 1-(P,P adamantyl, t-butyl phosphinomethyl)-2-(di-pyridin-2-yl-phosphinomethyl)-4-phenylferrocene, t-butyl phosphinomethyl)-2-(di-pyridin-2-yl-phosphinomethyl)-1-phenylferrocene, 1-(P,P-adamantyl, t-butyl phosphinomethyl)-2-(di-pyridin-2-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(P,P adamantyl, t-butyl phosphinomethyl)-2-(di-pyridin-2-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(P,P adamantyl, t-butyl phosphinomethyl)-2-(di-pyridin-2-yl-phosphinomethyl)-1′-(trimethylsilyl)ferrocene, 1-(P,P adamantyl, t-butyl phosphinomethyl)-2-(di-pyridin-2-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(P,P adamantyl, t-butyl phosphinomethyl)-2-(di-pyridin-2-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(P,P-adamantyl, t-butyl phosphinomethyl)-2-(di-pyridin-2-yl-phosphinomethyl)-1′-(2′-phenylprop-2′-yl)ferrocene, 1-(P,P-adamantyl, t-butyl phosphinomethyl)-2-(di-pyridin-2-yl-phosphinomethyl)-4,5-(di-t-butyl)ferrocene, 1-(P,P-adamantyl, t-butyl phosphinomethyl)-2-(di-pyridin-2-yl-phosphinomethyl)-4-t butylferrocene, 1-(P,P-adamantyl, t-butyl phosphinomethyl)-2-(di-pyridin-2-yl-phosphinomethyl)-1′-t-butylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyridin-2-yl-phosphinomethyl)-4,5-diphenyl-methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyridin-2-ylphosphinomethyl)-4-phenyl-methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyridin-2-ylphosphinomethyl)-1′-phenyl-methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyridin-2-yl-phosphinomethyl)-4,5-bis(trimethylsilyl)-methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyridin-2-ylphosphinomethyl)-4-(trimethylsilyl)-methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyridin-2-ylphosphinomethyl)-1′-(trimethylsilyl)-methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyridin-2-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)-methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyridin-2-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)-methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyridin-2-yl-phosphinomethyl)-1′-(2′-phenylprop-2′-yl)-methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyridin-2-yl-phosphinomethyl)-4,5-(di-t-butyl)-methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyridin-2-yl-phosphinomethyl)-4-t-butyl-methylferrocene, and 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyridin-2-yl-phosphinomethyl)-1′-t-butyl-methylferrocene.

4. The bidentate ligand according to claim 1 wherein A and B are methylene.

5. The bidentate ligand according to claim 1 , wherein Q 1 and Q 2 are each phosphorous.

6. The bidentate ligand according to claim 1 being 1-(di-tert-butylphosphinomethyl)-2-(pyridin-2-yl-phenylphosphinomethyl)ferrocene.

7. The bidentate ligand according to claim 1 being 1-(di-t-butylphosphinomethyl)-2-(di-pyridin-2-yl-phosphinomethyl)ferrocene.

8. The bidentate ligand according to claim 1 selected from the group consisting of 1-(di-tert-butylphosphinomethyl)-2-(di-pyridin-3-yl-phosphinomethyl)ferrocene, 1-(di-tert-pentylphosphinomethyl)-2-(di-pyridin-3-yl-phosphinomethyl)ferrocene, 1-(diadamantylphosphinomethyl)-2-(di-pyridin-3-yl-phosphinomethyl)ferrocene, 1-(di-3,5-dimethyladamantylphosphinomethyl)-2-(di-pyridin-3-yl-phosphinomethyl)ferrocene, 1-(di-5-tert-butyladamantylphosphinomethyl)-2-(di-pyridin-3-yl-phosphinomethyl)ferrocene, 1-(1-adamantyl-tert-butyl-phosphinomethyl)-2-(di-pyridin-3-yl-phosphinomethyl)ferrocene, 1-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one)-2-(di-pyridin-3-yl-phosphino)-1,2-dimethylferrocene, 1-(2-(phospha-adamantyl))-2-(di-pyridin-3-yl-phosphino)-1,2-dimethylferrocene, 1-(dicongressylphosphinomethyl)-2-(di-pyridin-3-yl-phosphinomethyl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyridin-3-yl-phosphinomethyl)-4,5-diphenylferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyridin-3-yl-phosphinomethyl)-4-phenylferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyridin-3-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyridin-3-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyridin-3-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyridin-3-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyridin-3-yl-phosphinomethyl)-4,5-di-t-butylferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyridin-3-yl-phosphinomethyl)-4-t-butylferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyridin-3-yl-phosphinomethyl)-4,5-diphenylferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyridin-3-yl-phosphinomethyl)-4-phenylferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyridin-3-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyridin-3-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyridin-3-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyridin-3-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyridin-3-yl-phosphinomethyl)-4,5-(di-t-butyl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyridin-3-yl-phosphinomethyl)-4-t-butylferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyridin-3-yl-phosphinomethyl)-4,5 diphenylferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyridin-3-yl-phosphinomethyl)-4-phenylferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyridin-3-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyridin-3-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyridin-3-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyridin-3-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyridin-3-yl-phosphinomethyl)-4,5-(di-t-butyl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyridin-3-yl-phosphinomethyl)-4-t-butylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyridin-3-yl-phosphinomethyl)-4,5-diphenylmethylferrocene, 1 (P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyridin-3-yl-phosphinomethyl)-4-phenyl-methylferrocene, 1 (P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyridin-3-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyridin-3-yl-phosphinomethyl)-4-(trimethylsilyl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyridin-3-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyridin-3-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyridin-3-yl-phosphinomethyl)-4,5-(di-t-butyl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyridin-3-yl-phosphinomethyl)-4-t-butylmethylferrocene, 1-(P,P-adamantyl-t-butyl phosphinomethyl)-2-(di-pyridin-3-yl-phosphinomethyl)-4,5-diphenylferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-pyridin-3-yl-phosphinomethyl)-4-phenylferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-pyridin-3-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(P,P-adamantly-t-butyl-phosphinomethyl)-2-(di-pyridin-3-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(P,P-adamantyl-t-butyl phosphinomethyl)-2-(di-pyridin-3-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-pyridin-3-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(P,P-adamantly-t-butyl-phosphinomethyl)-2-(di-pyridin-3-yl-phosphinomethyl)-4,5-(di-t-butyl)ferrocene, and 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-pyridin-3-yl-phosphinomethyl)-4-t-butylferrocene.

9. The bidentate ligand according to claim 1 selected from the group consisting of 1-(di-tert-butylphosphinomethyl)-2-(di-piperidin-2-yl-phosphinomethyl)ferrocene, 1-(di-tert-pentylphosphinomethyl)-2-(di-piperidin-2-yl-phosphinomethyl)ferrocene, 1-(diadamantylphosphinomethyl)-2-(di-piperidin-2-yl-phosphinomethyl)ferrocene, 1-(di-3,5-dimethyladamantylphosphinomethyl)-2-(di-piperidin-2-yl-phosphinomethyl)ferrocene, 1-(di-5-tert-butyladamantylphosphinomethyl)-2-(di-piperidin-2-yl-phosphinomethyl)ferrocene, 1-(1 adamantyl-tert-butyl-phosphinomethyl)-2-(di-piperidin-2-yl-phosphinomethyl)ferrocene, 1-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one)-2-(di-piperidin-2-yl-phosphino)-1,2-dimethylferrocene, 1-(2-(phospha-adamantyl))-2-(di-piperidin-2-yl-phosphino)-1,2-dimethylferrocene, 1-(dicongressylphosphinomethyl)-2-(di-piperidin-2-yl-phosphinomethyl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-piperidin-2-yl-phosphinomethyl)-4,5-diphenylferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-piperidin-2-yl-phosphinomethyl)-4-phenylferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-piperidin-2-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-piperidin-2-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-piperidin-2-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-piperidin-2-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-piperidin-2-yl-phosphinomethyl)-4,5-di-t-butylferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-piperidin-2-yl-phosphinomethyl)-4-t-butylferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-piperidin-2-yl-phosphinomethyl)-4,5-diphenylferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-piperidin-2-yl-phosphinomethyl)-4-phenylferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-piperidin-2-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-piperidin-2-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-piperidin-2-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-piperidin-2-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-piperidin-2-yl-phosphinomethyl)-4,5-(di-t-butyl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-piperidin-2-yl-phosphinomethyl)-4-t-butylferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-piperidin-2-yl-phosphinomethyl)-4,5-diphenylferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-piperidin-2-yl-phosphinomethyl)-4-phenylferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-piperidin-2-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-piperidin-2-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-piperidin-2-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-piperidin-2-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-piperidin-2-yl-phosphinomethyl)-4,5-(di-t-butyl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-piperidin-2-yl-phosphinomethyl)-4-t-butylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-piperidin-2-yl-phosphinomethyl)-4,5-diphenylmethylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-piperidin-2-yl-phosphinomethyl)-4-phenylmethylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-piperidin-2-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-piperidin-2-yl-phosphinomethyl)-4-(trimethylsilyl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-piperidin-2-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-piperidin-2-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-piperidin-2-yl-phosphinomethyl)-4,5-(di-t-butyl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-piperidin-2-yl-phosphinomethyl)-4-t-butylmethylferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-piperidin-2-yl-phosphinomethyl)-4,5-diphenylferrocene, 1-(P,P-adamantyl, t-butyl-phosphinomethyl)-2-(di-piperidin-2-yl-phosphinomethyl)-4-phenylferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-piperidin-2-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(P,P-adamantyl-t-butyl phosphinomethyl)-2-(di-piperidin-2-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-piperidin-2-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-piperidin-2-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-piperidin-2-yl-phosphinomethyl)-4,5-(di-t-butyl)ferrocene, and 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-piperidin-2-yl-phosphinomethyl)-4-t-butylferrocene.

10. The bidentate ligand according to claim 1 selected from the group consisting of 1-(di-tert-butylphosphinomethyl)-2-(di-piperidin-3-yl-phosphinomethyl)ferrocene, 1-(di-tert-pentylphosphinomethyl)-2-(di-piperidin-3-yl-phosphinomethyl)ferrocene, 1-(diadamantylphosphinomethyl)-2-(di-piperidin-3-yl-phosphinomethyl)ferrocene, 1-(di-3,5-dimethyladamantylphosphinomethyl)-2-(di-piperidin-3-yl-phosphinomethyl)ferrocene, 1-(di-5-tert-butyladamantylphosphinomethyl)-2-(di-piperidin-3-yl-phosphinomethyl)ferrocene, 1-(1 adamantyl-tert-butyl-phosphinomethyl)-2-(di-piperidin-3-yl-phosphinomethyl)ferrocene, 1-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one)-2-(di-piperidin-3-yl-phosphino)-1,2-dimethylferrocene, 1-(2-(phospha-adamantyl))-2-(di-piperidin-3-yl-phosphino)-1,2-dimethylferrocene, 1-(dicongressylphosphinomethyl)-2-(di-piperidin-3-yl-phosphinomethyl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-piperidin-3-yl-phosphinomethyl)-4,5-diphenylferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-piperidin-3-yl-phosphinomethyl)-4-phenylferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-piperidin-3-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-piperidin-3-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-piperidin-3-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-piperidin-3-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-piperidin-3-yl-phosphinomethyl)-4,5-di-t-butylferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-piperidin-3-yl-phosphinomethyl)-4-t-butylferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-piperidin-3-yl-phosphinomethyl)-4,5-diphenylferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-piperidin-3-yl-phosphinomethyl)-4-phenylferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-piperidin-3-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-piperidin-3-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-piperidin-3-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-piperidin-3-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-piperidin-3-yl-phosphinomethyl)-4,5-(di-t-butyl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-piperidin-3-yl-phosphinomethyl)-4-t-butylferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-piperidin-3-yl-phosphinomethyl)-4,5-diphenylferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-piperidin-3-yl-phosphinomethyl)-4-phenylferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-piperidin-3-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-piperidin-3-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-piperidin-3-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-piperidin-3-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-piperidin-3-yl-phosphinomethyl)-4,5-(di-t-butyl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-piperidin-3-yl-phosphinomethyl)-4-t-butylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-piperidin-3-yl-phosphinomethyl)-4,5-diphenylmethylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-piperidin-3-yl-phosphinomethyl)-4-phenylmethylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-piperidin-3-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-piperidin-3-yl-phosphinomethyl)-4-(trimethylsilyl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-piperidin-3-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-piperidin-3-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-piperidin-3-yl-phosphinomethyl)-4,5-(di-t-butyl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-piperidin-3-yl-phosphinomethyl)-4-t-butylmethylferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-piperidin-3-yl-phosphinomethyl)-4,5-diphenylferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-piperidin-3-yl-phosphinomethyl)-4-phenylferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-piperidin-3-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(P,P-adamantyl-t-butyl phosphinomethyl)-2-(di-piperidin-3-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-piperidin-3-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-piperidin-3-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-piperidin-3-yl-phosphinomethyl)-4,5-(di-t-butyl)ferrocene, and adamantyl, t 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-piperidin-3-yl-phosphinomethyl)-4-t-butylferrocene.

11. The bidentate ligand according to claim 1 selected from the group consisting of 1-(di-tert-butylphosphinomethyl)-2-(di-pyrrol-2-yl-phosphinomethyl)ferrocene, 1-(di-tert-pentylphosphinomethyl)-2-(di-pyrrol-2-yl-phosphinomethyl)ferrocene, 1-(diadamantylphosphinomethyl)-2-(di-pyrrol-2-yl-phosphinomethyl)ferrocene, 1-(di-3,5-dimethyladamantylphosphinomethyl)-2-(di-pyrrol-2-yl-phosphinomethyl)ferrocene, 1-(di-5-tert-butyladamantylphosphinomethyl)-2-(di-pyrrol-2-yl-phosphinomethyl)ferrocene, 1-(1-adamantyl tert-butyl-phosphinomethyl)-2-(di-pyrrol-2-yl-phosphinomethyl)ferrocene, 1-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one)-2-(di-pyrrol-2-yl-phosphino)-1,2-dimethylferrocene, 1-(2-(phospha-adamantyl))-2-(di-pyrrol-2-yl-phosphino)-1,2-dimethylferrocene, 1-(dicongressylphosphinomethyl)-2-(di-pyrrol-2-yl-phosphinomethyl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrrol-2-yl-phosphinomethyl)-4,5-diphenylferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrrol-2-yl-phosphinomethyl)-4-phenylferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrrol-2-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrrol-2-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrrol-2-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrrol-2-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrrol-2-yl-phosphinomethyl)-4,5-di-t-butylferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrrol-2-yl-phosphinomethyl)-4-t-butylferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrrol-2-yl-phosphinomethyl)-4,5-diphenylferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrrol-2-yl-phosphinomethyl)-4-phenylferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrrol-2-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrrol-2-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrrol-2-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrrol-2-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrrol-2-yl-phosphinomethyl)-4,5-(di-t-butyl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrrol-2-yl-phosphinomethyl)-4-t-butylferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrrol-2-yl-phosphinomethyl)-4,5 diphenylferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrrol-2-yl-phosphinomethyl)-4-phenylferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrrol-2-yl-phosphinomethyl)-4,5 bis-(trimethylsilyl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrrol-2-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrrol-2-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrrol-2-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrrol-2-yl-phosphinomethyl)-4,5-(di-t-butyl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrrol-2-yl-phosphinomethyl)-4-t-butylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrrol-2-yl-phosphinomethyl)-4,5-diphenylmethylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrrol-2-yl-phosphinomethyl)-4-phenylmethylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrrol-2-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrrol-2-yl-phosphinomethyl)-4-(trimethylsilyl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrrol-2-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrrol-2-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrrol-2-yl-phosphinomethyl)-4,5-(di-t-butyl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrrol-2-yl-phosphinomethyl)-4-t-butylmethylferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-pyrrol-2-yl-phosphinomethyl)-4,5-diphenylferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-pyrrol-2-yl-phosphinomethyl)-4-phenylferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-pyrrol-2-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-pyrrol-2-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-pyrrol-2-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-pyrrol-2-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-pyrrol-2-yl-phosphinomethyl)-4,5-(di-t-butyl)ferrocene, and 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-pyrrol-2-yl-phosphinomethyl)-4-t-butylferrocene.

12. The bidentate ligand according to claim 1 selected from the group consisting of 1-(di-tert-butylphosphinomethyl)-2-(di-pyrrol-3-yl-phosphinomethyl)ferrocene, 1-(di-tert-pentylphosphinomethyl)-2-(di-pyrrol-3-yl-phosphinomethyl)ferrocene, 1-(diadamantylphosphinomethyl)-2-(di-pyrrol-3-yl-phosphinomethyl)ferrocene, 1-(di-3,5-dimethyladamantylphosphinomethyl)-2-(di-pyrrol-3-yl-phosphinomethyl)ferrocene, 1-(di-5-tert-butyladamantylphosphinomethyl)-2-(di-pyrrol-3-yl-phosphinomethyl)ferrocene, 1-(1-adamantyl tert-butyl-phosphinomethyl)-2-(di-pyrrol-3-yl-phosphinomethyl)ferrocene, 1-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one)-2-(di-pyrrol-3-yl-phosphino)-1,2-dimethylferrocene, 1-(2-(phospha-adamantyl))-2-(di-pyrrol-3-yl-phosphino)-1,2-dimethylferrocene, 1-(dicongressylphosphinomethyl)-2-(di-pyrrol-3-yl-phosphinomethyl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrrol-3-yl-phosphinomethyl)-4,5-diphenylferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrrol-3-yl-phosphinomethyl)-4-phenylferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrrol-3-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrrol-3-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrrol-3-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrrol-3-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrrol-3-yl-phosphinomethyl)-4,5-di-t-butylferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrrol-3-yl-phosphinomethyl)-4-t-butylferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrrol-3-yl-phosphinomethyl)-4,5-diphenylferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrrol-3-yl-phosphinomethyl)-4-phenylferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrrol-3-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrrol-3-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrrol-3-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrrol-3-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrrol-3-yl-phosphinomethyl)-4,5-(di-t-butyl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrrol-3-yl-phosphinomethyl)-4-t-butylferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrrol-3-yl-phosphinomethyl)-4,5 diphenylferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrrol-3-yl-phosphinomethyl)-4-phenylferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrrol-3-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrrol-3-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrrol-3-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrrol-3-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrrol-3-yl-phosphinomethyl)-4,5-(di-t-butyl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrrol-3-yl-phosphinomethyl)-4-t-butylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrrol-3-yl-phosphinomethyl)-4,5-diphenylmethylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrrol-3-yl-phosphinomethyl)-4-phenylmethylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrrol-3-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrrol-3-yl-phosphinomethyl)-4-(trimethylsilyl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrrol-3-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrrol-3-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrrol-3-yl-phosphinomethyl)-4,5-(di-t-butyl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrrol-3-yl-phosphinomethyl)-4-t-butylmethylferrocene, 1-(P,P adamantyl, t-butyl phosphinomethyl)-2-(di-pyrrol-3-yl-phosphinomethyl)-4,5-diphenylferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-pyrrol-3-yl-phosphinomethyl)-4-phenylferrocene, 1-(P,P-adamantyl-t-butyl phosphinomethyl)-2-(di-pyrrol-3-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-pyrrol-3-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-pyrrol-3-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-pyrrol-3-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-pyrrol-3-yl-phosphinomethyl)-4,5-(di-t-butyl)ferrocene, and 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-pyrrol-3-yl-phosphinomethyl)-4-t-butylferrocene.

13. The bidentate ligand according to claim 1 selected from the group consisting of 1-(di-tert-butylphosphinomethyl)-2-(di-pyrrolidin-2-yl-phosphinomethyl)ferrocene, 1-(di-tert-pentylphosphinomethyl)-2-(di-pyrrolidin-2-yl-phosphinomethyl)ferrocene, 1-(diadamantylphosphinomethyl)-2-(di-pyrrolidin-2-yl-phosphinomethyl)ferrocene, 1-(di-3,5-dimethyladamantylphosphinomethyl)-2-(di-pyrrolidin-2-yl-phosphinomethyl)ferrocene, 1-(di-5-tert-butyladamantylphosphinomethyl)-2-(di-pyrrolidin-2-yl-phosphinomethyl)ferrocene, 1-(1 adamantyl-tert-butyl-phosphinomethyl)-2-(di-pyrrolidin-2-yl-phosphinomethyl)ferrocene, 1-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one)-2-(di-pyrrolidin-2-yl-phosphino)-1,2-dimethylferrocene, 1-(2-(phospha-adamantyl))-2-(di-pyrrolidin-2-yl-phosphino)-1,2-dimethylferrocene, 1-(dicongressylphosphinomethyl)-2-(di-pyrrolidin-2-yl-phosphinomethyl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrrolidin-2-yl-phosphinomethyl)-4,5-diphenylferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrrolidin-2-yl-phosphinomethyl)-4-phenylferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrrolidin-2-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrrolidin-2-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrrolidin-2-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrrolidin-2-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrrolidin-2-yl-phosphinomethyl)-4,5-di-t-butylferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrrolidin-2-yl-phosphinomethyl)-4-t-butylferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrrolidin-2-yl-phosphinomethyl)-4,5-diphenylferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrrolidin-2-yl-phosphinomethyl)-4-phenylferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrrolidin-2-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrrolidin-2-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrrolidin-2-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrrolidin-2-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrrolidin-2-yl-phosphinomethyl)-4,5-(di-t-butyl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrrolidin-2-yl-phosphinomethyl)-4-t-butylferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrrolidin-2-yl-phosphinomethyl)-4,5-diphenylferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrrolidin-2-yl-phosphinomethyl)-4-phenylferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrrolidin-2-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrrolidin-2-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrrolidin-2-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrrolidin-2-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrrolidin-2-yl-phosphinomethyl)-4,5-(di-t-butyl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrrolidin-2-yl-phosphinomethyl)-4-t-butylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrrolidin-2-yl-phosphinomethyl)-4,5-diphenylmethylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrrolidin-2-yl-phosphinomethyl)-4-phenylmethylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrrolidin-2-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrrolidin-2-yl-phosphinomethyl)-4-(trimethylsilyl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrrolidin-2-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrrolidin-2-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrrolidin-2-yl-phosphinomethyl)-4,5-(di-t-butyl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrrolidin-2-yl-phosphinomethyl)-4-t-butylmethylferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-pyrrolidin-2-yl-phosphinomethyl)-4,5-diphenylferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-pyrrolidin-2-yl-phosphinomethyl)-4-phenylferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-pyrrolidin-2-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(P,P-adamantyl-t-butyl phosphinomethyl)-2-(di-pyrrolidin-2-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-pyrrolidin-2-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-pyrrolidin-2-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-pyrrolidin-2-yl-phosphinomethyl)-4,5-(di-t-butyl)ferrocene, and adamantyl, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-pyrrolidin-2-yl-phosphinomethyl)-4-t-butylferrocene.

14. The bidentate ligand according to claim 1 selected from the group consisting of 1-(di-tert-butylphosphinomethyl)-2-(di-pyrrolidin-3-yl-phosphinomethyl)ferrocene, 1-(di-tert-pentylphosphinomethyl)-2-(di-pyrrolidin-3-yl-phosphinomethyl)ferrocene, 1-(diadamantylphosphinomethyl)-2-(di-pyrrolidin-3-yl-phosphinomethyl)ferrocene, 1-(di-3,5-dimethyladamantylphosphinomethyl)-2-(di-pyrrolidin-3-yl-phosphinomethyl)ferrocene, 1-(di-5-tert-butyladamantylphosphinomethyl)-2-(di-pyrrolidin-3-yl-phosphinomethyl)ferrocene, 1-(1 adamantyl-tert-butyl-phosphinomethyl)-2-(di-pyrrolidin-3-yl-phosphinomethyl)ferrocene, 1-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one)-2-(di-pyrrolidin-3-yl-phosphino)-1,2-dimethylferrocene, 1-(2-(phospha-adamantyl))-2-(di-pyrrolidin-3-yl-phosphino)-1,2-dimethylferrocene, 1-(dicongressylphosphinomethyl)-2-(di-pyrrolidin-3-yl-phosphinomethyl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrrolidin-3-yl-phosphinomethyl)-4,5-diphenylferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrrolidin-3-yl-phosphinomethyl)-4-phenylferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrrolidin-3-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrrolidin-3-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrrolidin-3-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrrolidin-3-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrrolidin-3-yl-phosphinomethyl)-4,5-di-t-butylferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrrolidin-3-yl-phosphinomethyl)-4-t-butylferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrrolidin-3-yl-phosphinomethyl)-4,5-diphenylferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrrolidin-3-yl-phosphinomethyl)-4-phenylferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrrolidin-3-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrrolidin-3-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrrolidin-3-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrrolidin-3-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrrolidin-3-yl-phosphinomethyl)-4,5-(di-t-butyl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrrolidin-3-yl-phosphinomethyl)-4-t-butylferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrrolidin-3-yl-phosphinomethyl)-4,5 diphenylferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrrolidin-3-yl-phosphinomethyl)-4-phenylferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrrolidin-3-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrrolidin-3-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrrolidin-3-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrrolidin-3-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrrolidin-3-yl-phosphinomethyl)-4,5-(di-t-butyl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrrolidin-3-yl-phosphinomethyl)-4-t-butylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrrolidin-3-yl-phosphinomethyl)-4,5-diphenylmethylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrrolidin-3-yl-phosphinomethyl)-4-phenylmethylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrrolidin-3-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrrolidin-3-yl-phosphinomethyl)-4-(trimethylsilyl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrrolidin-3-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrrolidin-3-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrrolidin-3-yl-phosphinomethyl)-4,5-(di-t-butyl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrrolidin-3-yl-phosphinomethyl)-4-t-butylmethylferrocene, 1-(P,P-adamantyl-t-butyl phosphinomethyl)-2-(di-pyrrolidin-3-yl-phosphinomethyl)-4,5-diphenylferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-pyrrolidin-3-yl-phosphinomethyl)-4-phenylferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-pyrrolidin-3-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-pyrrolidin-3-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-pyrrolidin-3-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(P,P-adamantyl-t-butyl phosphinomethyl)-2-(di-pyrrolidin-3-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-pyrrolidin-3-yl-phosphinomethyl)-4,5-(di-t-butyl)ferrocene, and adamantyl, 1-(P,P-adamantyl-t-butyl phosphinomethyl)-2-(di-pyrrolidin-3-yl-phosphinomethyl)-4-t-butylferrocene.

15. The bidentate ligand according to claim 1 selected from the group consisting of 1-(di-tert-butylphosphinomethyl)-2-(di-quinolin-2-yl-phosphinomethyl)ferrocene, 1-(di-tert-pentylphosphinomethyl)-2-(di-quinolin-2-yl-phosphinomethyl)ferrocene, 1-(diadamantylphosphinomethyl)-2-(di-quinolin-2-yl-phosphinomethyl)ferrocene, 1-(di-3,5-dimethyladamantylphosphinomethyl)-2-(di-quinolin-2-yl-phosphinomethyl)ferrocene, 1-(di-5-tert-butyladamantylphosphinomethyl)-2-(di-quinolin-2-yl-phosphinomethyl)ferrocene, 1-(1 adamantyl-tert-butyl-phosphinomethyl)-2-(di-quinolin-2-yl-phosphinomethyl)ferrocene, 1-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one)-2-(di-quinolin-2-yl-phosphino)-1,2-dimethylferrocene, 1-(2-(phospha-adamantyl))-2-(di-quinolin-2-yl-phosphino)-1,2-dimethylferrocene, 1-(dicongressylphosphinomethyl)-2-(di-quinolin-2-yl-phosphinomethyl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-quinolin-2-yl-phosphinomethyl)-4,5-diphenylferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-quinolin-2-yl-phosphinomethyl)-4-phenylferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-quinolin-2-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-quinolin-2-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-quinolin-2-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-quinolin-2-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-quinolin-2-yl-phosphinomethyl)-4,5-di-t-butylferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-quinolin-2-yl-phosphinomethyl)-4-t-butylferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-quinolin-2-yl-phosphinomethyl)-4,5-diphenylferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-quinolin-2-yl-phosphinomethyl)-4-phenylferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-quinolin-2-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-quinolin-2-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-quinolin-2-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-quinolin-2-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-quinolin-2-yl-phosphinomethyl)-4,5-(di-t-butyl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-quinolin-2-yl-phosphinomethyl)-4-t-butylferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-quinolin-2-yl-phosphinomethyl)-4,5-diphenylferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-quinolin-2-yl-phosphinomethyl)-4-phenylferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-quinolin-2-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-quinolin-2-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-quinolin-2-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-quinolin-2-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-quinolin-2-yl-phosphinomethyl)-4,5-(di-t-butyl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-quinolin-2-yl-phosphinomethyl)-4-t-butylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-quinolin-2-yl-phosphinomethyl)-4,5-diphenylmethylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-quinolin-2-yl-phosphinomethyl)-4-phenylmethylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-quinolin-2-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-quinolin-2-yl-phosphinomethyl)-4-(trimethylsilyl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-quinolin-2-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-quinolin-2-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-quinolin-2-yl-phosphinomethyl)-4,5-(di-t-butyl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-quinolin-2-yl-phosphinomethyl)-4-t-butylmethylferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-quinolin-2-yl-phosphinomethyl)-4,5-diphenylferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-quinolin-2-yl-phosphinomethyl)-4-phenylferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-Quinolin-2-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-quinolin-2-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-quinolin-2-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(P,P-adamantyl-t-butyl phosphinomethyl)-2-(di-quinolin-2-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-quinolin-2-yl-phosphinomethyl)-4,5-(di-t-butyl)ferrocene, and 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-Quinolin-2-yl-phosphinomethyl)-4-t-butylferrocene.

16. The bidentate ligand according to claim 1 selected from the group consisting of 1-(di-tert-butylphosphinomethyl)-2-(di-pyrazin-2-yl-phosphinomethyl)ferrocene, 1-(di-tert-pentylphosphinomethyl)-2-(di-pyrazin-2-yl-phosphinomethyl)ferrocene, 1-(diadamantylphosphinomethyl)-2-(di-pyrazin-2-yl-phosphinomethyl)ferrocene, 1-(di-3,5-dimethyladamantylphosphinomethyl)-2-(di-pyrazin-2-yl-phosphinomethyl)ferrocene, 1-(di-5-tert-butyladamantylphosphinomethyl)-2-(di-pyrazin-2-yl-phosphinomethyl)ferrocene, 1-(1 adamantyl-tert-butyl-phosphinomethyl)-2-(di-pyrazin-2-yl-phosphinomethyl)ferrocene, 1-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one)-2-(di-pyrazin-2-yl-phosphino)-1,2-dimethylferrocene, 1-(2-(phospha-adamantyl))-2-(di-pyrazin-2-yl-phosphino)-1,2-dimethylferrocene, 1-(dicongressylphosphinomethyl)-2-(di-pyrazin-2-yl-phosphinomethyl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrazin-2-yl-phosphinomethyl)-4,5-diphenylferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrazin-2-yl-phosphinomethyl)-4-phenylferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrazin-2-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrazin-2-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrazin-2-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrazin-2-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrazin-2-yl-phosphinomethyl)-4,5-di-t-butylferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrazin-2-yl-phosphinomethyl)-4-t-butylferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrazin-2-yl-phosphinomethyl)-4,5-diphenylferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrazin-2-yl-phosphinomethyl)-4-phenylferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrazin-2-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrazin-2-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrazin-2-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrazin-2-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrazin-2-yl-phosphinomethyl)-4,5-(di-t-butyl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrazin-2-yl-phosphinomethyl)-4-t-butylferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrazin-2-yl-phosphinomethyl)-4,5 diphenylferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrazin-2-yl-phosphinomethyl)-4-phenylferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrazin-2-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrazin-2-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrazin-2-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrazin-2-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrazin-2-yl-phosphinomethyl)-4,5-(di-t-butyl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrazin-2-yl-phosphinomethyl)-4-t-butylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrazin-2-yl-phosphinomethyl)-4,5-diphenylmethylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrazin-2-yl-phosphinomethyl)-4-phenylmethylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrazin-2-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrazin-2-yl-phosphinomethyl)-4-(trimethylsilyl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrazin-2-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrazin-2-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrazin-2-yl-phosphinomethyl)-4,5-(di-t-butyl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrazin-2-yl-phosphinomethyl)-4-t-butylmethylferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-pyrazin-2-yl-phosphinomethyl)-4,5-diphenylferrocene, 1-(P,P-adamantyl-t-butyl phosphinomethyl)-2-(di-pyrazin-2-yl-phosphinomethyl)-4-phenylferrocene, 1-(P, P-adamantyl-t-butyl-phosphinomethyl)-2-(di-pyrazin-2-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-pyrazin-2-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-pyrazin-2-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(P,P-adamantyl-t-butyl phosphinomethyl)-2-(di-pyrazin-2-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-pyrazin-2-yl-phosphinomethyl)-4,5-(di-t-butyl)ferrocene, and 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-pyrazin-2-yl-phosphinomethyl)-4-t-butylferrocene.

17. The bidentate ligand according to claim 1 selected from the group consisting of 1-(di-tert-butylphosphinomethyl)-2-(di-piperazin-2-yl-phosphinomethyl)ferrocene, 1-(di-tert-pentylphosphinomethyl)-2-(di-piperazin-2-yl-phosphinomethyl)ferrocene, 1-(diadamantylphosphinomethyl)-2-(di-piperazin-2-yl-phosphinomethyl)ferrocene, 1-(di-3,5-dimethyladamantylphosphinomethyl)-2-(di-piperazin-2-yl-phosphinomethyl)ferrocene, 1-(di-5-tert-butyladamantylphosphinomethyl)-2-(di-piperazin-2-yl-phosphinomethyl)ferrocene, 1-(1 adamantyl-tert-butyl-phosphinomethyl)-2-(di-piperazin-2-yl-phosphinomethyl)ferrocene, 1-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one)-2-(di-piperazin-2-yl-phosphino)-1,2-dimethylferrocene, 1-(2-(phospha-adamantyl))-2-(di-piperazin-2-yl-phosphino)-1,2-dimethylferrocene, 1-(dicongressylphosphinomethyl)-2-(di-piperazin-2-yl-phosphinomethyl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-piperazin-2-yl-phosphinomethyl)-4,5-diphenylferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-piperazin-2-yl-phosphinomethyl)-4-phenylferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-piperazin-2-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-piperazin-2-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-piperazin-2-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-piperazin-2-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-piperazin-2-yl-phosphinomethyl)-4,5-di-t-butylferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-piperazin-2-yl-phosphinomethyl)-4-t-butylferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-piperazin-2-yl-phosphinomethyl)-4,5-diphenylferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-piperazin-2-yl-phosphinomethyl)-4-phenylferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-piperazin-2-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-piperazin-2-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-piperazin-2-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-piperazin-2-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-piperazin-2-yl-phosphinomethyl)-4,5-(di-t-butyl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-piperazin-2-yl-phosphinomethyl)-4-t-butylferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-piperazin-2-yl-phosphinomethyl)-4,5-diphenylferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-piperazin-2-yl-phosphinomethyl)-4-phenylferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-piperazin-2-yl-phosphinomethyl)-4,5 bis-(trimethylsilyl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-piperazin-2-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-piperazin-2-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-piperazin-2-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-piperazin-2-yl-phosphinomethyl)-4,5-(di-t-butyl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-piperazin-2-yl-phosphinomethyl)-4-t-butylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-piperazin-2-yl-phosphinomethyl)-4,5-diphenylmethylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-piperazin-2-yl-phosphinomethyl)-4-phenylmethylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-piperazin-2-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-piperazin-2-yl-phosphinomethyl)-4-(trimethylsilyl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-piperazin-2-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-piperazin-2-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-piperazin-2-yl-phosphinomethyl)-4,5-(di-t-butyl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-piperazin-2-yl-phosphinomethyl)-4-t-butylmethylferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-piperazin-2-yl-phosphinomethyl)-4,5-diphenylferrocene, 1-(P,P-adamantyl-t-butyl phosphinomethyl)-2-(di-piperazin-2-yl-phosphinomethyl)-4-phenylferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-piperazin-2-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-piperazin-2-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-piperazin-2-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-piperazin-2-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-piperazin-2-yl-phosphinomethyl)-4,5-(di-t-butyl)ferrocene, and adamantyl, 1-(P,P-adamantyl-t-butyl phosphinomethyl)-2-(di-piperazin-2-yl-phosphinomethyl)-4-t-butylferrocene.

18. The bidentate ligand according to claim 1 selected from the group consisting of 1-(di-tert-butylphosphinomethyl)-2-(di-pyrimidin-2-yl-phosphinomethyl)ferrocene, 1-(di-tert-pentylphosphinomethyl)-2-(di-pyrimidin-2-yl-phosphinomethyl)ferrocene, 1-(diadamantylphosphinomethyl)-2-(di-pyrimidin-2-yl-phosphinomethyl)ferrocene, 1-(di-3,5-dimethyladamantylphosphinomethyl)-2-(di-pyrimidin-2-yl-phosphinomethyl)ferrocene, 1-(di-5-tert-butyladamantylphosphinomethyl)-2-(di-pyrimidin-2-yl-phosphinomethyl)ferrocene, 1-(1 adamantyl-tert-butyl-phosphinomethyl)-2-(di-pyrimidin-2-yl-phosphinomethyl)ferrocene, 1-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one)-2-(di-pyrimidin-2-yl-phosphino)-1,2-dimethylferrocene, 1-(2-(phospha-adamantyl))-2-(di-pyrimidin-2-yl-phosphino)-1,2-dimethylferrocene, 1-(dicongressylphosphinomethyl)-2-(di-pyrimidin-2-yl-phosphinomethyl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrimidin-2-yl-phosphinomethyl)-4,5-diphenylferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrimidin-2-yl-phosphinomethyl)-4-phenylferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrimidin-2-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrimidin-2-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrimidin-2-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrimidin-2-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrimidin-2-yl-phosphinomethyl)-4,5-di-t-butylferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-pyrimidin-2-yl-phosphinomethyl)-4-t-butylferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrimidin-2-yl-phosphinomethyl)-4,5-diphenylferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrimidin-2-yl-phosphinomethyl)-4-phenylferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrimidin-2-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrimidin-2-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrimidin-2-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrimidin-2-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrimidin-2-yl-phosphinomethyl)-4,5-(di-t-butyl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-pyrimidin-2-yl-phosphinomethyl)-4-t-butylferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrimidin-2-yl-phosphinomethyl)-4,5-diphenylferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrimidin-2-yl-phosphinomethyl)-4-phenylferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrimidin-2-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrimidin-2-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrimidin-2-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrimidin-2-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrimidin-2-yl-phosphinomethyl)-4,5-(di-t-butyl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-pyrimidin-2-yl-phosphinomethyl)-4-t-butylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrimidin-2-yl-phosphinomethyl)-4,5-diphenylmethylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrimidin-2-yl-phosphinomethyl)-4-phenylmethylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrimidin-2-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrimidin-2-yl-phosphinomethyl)-4-(trimethylsilyl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrimidin-2-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrimidin-2-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrimidin-2-yl-phosphinomethyl)-4,5-(di-t-butyl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-pyrimidin-2-yl-phosphinomethyl)-4-t-butylmethylferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-pyrimidin-2-yl-phosphinomethyl)-4,5-diphenylferrocene, 1-(P,P-adamantyl, t-butyl-phosphinomethyl)-2-(di-pyrimidin-2-yl-phosphinomethyl)-4-phenylferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-pyrimidin-2-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-pyrimidin-2-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-pyrimidin-2-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-pyrimidin-2-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-pyrimidin-2-yl-phosphinomethyl)-4,5-(di-t-butyl)ferrocene, and 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-pyrimidin-2-yl-phosphinomethyl)-4-t-butylferrocene.

19. The bidentate ligand according to claim 1 selected from the group consisting of 1-(di-tert-butylphosphinomethyl)-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)ferrocene, 1-(di-tert-pentylphosphinomethyl)-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)ferrocene, 1-(diadamantylphosphinomethyl)-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)ferrocene, 1-(di-3,5-dimethyladamantylphosphinomethyl)-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)ferrocene, 1-(di-5-tert-butyladamantylphosphinomethyl)-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)ferrocene, 1-(1 adamantyl-tert-butyl-phosphinomethyl)-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)ferrocene, 1-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one)-2-(di-hexahydro-pyrimidin-2-yl-phosphino)-1,2-dimethylferrocene, 1-(2-(phospha-adamantyl))-2-(di-hexahydro-pyrimidin-2-yl-phosphino)-1,2-dimethylferrocene, 1-(dicongressylphosphinomethyl)-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)-4,5-diphenylferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)-4-phenylferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)-4,5-di-t-butylferrocene, 1-(di-t-butylphosphinomethyl)-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)-4-t-butylferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)-4,5-diphenylferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)-4-phenylferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)-4,5-(di-t-butyl)ferrocene, 1-(2-phosphinomethyl-adamantyl)-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)-4-t-butylferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)-4,5 diphenylferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)-4-phenylferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)-4,5-(di-t-butyl)ferrocene, 1-(di-adamantylphosphinomethyl)-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)-4-t-butylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)-4,5-diphenylmethylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)-4-phenylmethylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)-4-(trimethylsilyl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)-4,5-(di-t-butyl)methylferrocene, 1-(P-(2,2,6,6-tetramethyl-phospha-cyclohexan-4-one))-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)-4-t-butylmethylferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)-4,5-diphenylferrocene, 1-(P,P-adamantly-t-butyl-phosphinomethyl)-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)-4-phenylferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)-4,5-bis-(trimethylsilyl)ferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)-4-(trimethylsilyl)ferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)-4,5-di-(2′-phenylprop-2′-yl)ferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)-4-(2′-phenylprop-2′-yl)ferrocene, 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)-4,5-(di-t-butyl)ferrocene, and 1-(P,P-adamantyl-t-butyl-phosphinomethyl)-2-(di-hexahydro-pyrimidin-2-yl-phosphinomethyl)-4-t-butylferrocene.

20. A process for the carbonylation of ethylenically unsaturated compounds comprising reacting said compound with carbon monoxide in the presence of a source of hydroxyl groups, optionally, a source of anions and of a catalyst system, the catalyst system obtainable by combining:

(a) a metal of Group 8, 9 or 10 of the Periodic Table or a compound thereof; and

(b) the bidentate ligand of formula (I) according to claim 1 .

21. A process for the carbonylation of ethylenically unsaturated compounds as claimed in claim 20 , wherein the catalyst system has a pKa in aqueous solution at 18° C. of between −2 and 6.

22. A process for the carbonylation of ethylenically unsaturated compounds as claimed in claim 20 , wherein the catalyst system has a pKa in aqueous solution at 18° C. of between 0 and 5.

23. The process for using the bidentate ligand according to claim 20 wherein A and B are methylene.

24. A novel complex comprising the bidentate ligand of formula I according to claim 1 coordinated to a metal of Group 8, 9 or 10 of the Periodic Table or a compound thereof.

25. A catalyst system for catalysing the carbonylation of an ethylenically unsaturated compound, the system is obtainable by combining:

a) a metal of Group 8, 9 or 10 of the Periodic Table or a compound thereof,

b) the bidentate ligand of formula I according to claim 1 , and

c) optionally, an acid.

26. The catalyst system according to claim 25 , wherein said acid has a pKa measured in dilute aqueous solution at 18° C. of between −2 and 6.

27. The catalyst system according to claim 25 , wherein said acid has a pKa measured in dilute aqueous solution at 18° C. of between 0 and 5.