Phosphine ligands for catalytic reactions

1. A phosphine ligand, said ligand having a structure corresponding to formula (I),

or a salt thereof,

wherein

Ar 1 and Ar 2 are each independently aryl or heteroaryl, and wherein Ar 1 and Ar 2 are each independently optionally substituted with one or more R 1 and R 2 , respectively;

R 1 and R 2 are independently selected at each occurrence from the group consisting of hydrogen; amino; hydroxyl; cyano; halo; alkyl; alkenyl; alkynyl; haloalkyl; haloalkoxy; oxoalkyl; alkoxy; aryloxy; heteroaryloxy; arylamino; heteroarylamino; alkylamino; dialkylamino; cycloalkyl optionally substituted with alkyl, alkenyl, alkynyl, alkoxy, cyano, halo, haloalkyl or haloalkoxy; cycloalkyloxy optionally substituted with alkyl, alkenyl, alkynyl, alkoxy, cyano, halo, haloalkyl or haloalkoxy; 5- or 6-membered heteroaryl optionally substituted with alkyl, alkenyl, alkynyl, alkoxy, cyano, halo, haloalkyl or haloalkoxy; phenyl optionally substituted with alkyl, alkenyl, alkynyl, alkoxy, cyano, halo, haloalkyl or haloalkoxy; hydroxyalkyl; hydroxyalkoxy; alkoxyalkyl; aminoalkyl; N-alkylaminoalkyl; N,N-dialkylaminoalkyl; N,N,N-trialkylammoniumalkyl; L 1 -C(O)—OR 1′ , L 1 -P(O)—(OR 1′ ) 2 , or L 1 -S(O) 2 —OR 1′ , wherein L 1 is a bond or alkylene, and R 1′ is selected from the group consisting of hydrogen, alkyl and hydroxyalkyl; L 2 -O—C(O)—R 2′ , wherein L 2 is a bond or alkylene, and R 2′ is alkyl or hydroxyalkyl; L 3 -C(O)—NR 3′ R 4′ , wherein L 3 is a bond or alkylene, and R 3′ and R 4′ are each independently selected from the group consisting of hydrogen, alkyl, and hydroxyalkyl; L 4 -NR 5′ —C(O)—R 6′ , wherein L 4 is a bond or alkylene, R 5′ is hydrogen or alkyl, and R 6′ is alkyl or hydroxyalkyl; sulfamoyl; N-(alkyl)sulfamoyl; N,N-(dialkyl)sulfamoyl; sulfonamide; sulfate; alkylthio; thioalkyl; and a ring containing an alkylene or —O—(CH 2 ) m —O— formed by the joining together of any two R 1 or any two R 2 or an R 1 and an R 2 , wherein m is 1, 2, 3 or 4;

X is a phosphine of formula (Id), or a salt thereof:

wherein as to R 10 , R 11 , R 12 , R 13 ,

i. R 10 or R 11 together with R 12 or R 13 form a ring; wherein if any of substituents R 10 , R 11 , R 12 and R 13 do not form a ring, said substituents are each independently selected from the group consisting of hydrogen; alkyl; alkenyl; haloalkyl; alkynyl; oxoalkyl; cycloalkyl optionally substituted with alkyl, alkenyl, alkynyl, alkoxy, cyano, halo, haloalkyl or haloalkoxy; heterocyclyl optionally substituted with alkyl, alkenyl, alkynyl, alkoxy, cyano, halo, haloalkyl or haloalkoxy; 5-6 membered heteroaryl optionally substituted with alkyl, alkenyl, alkynyl, alkoxy, cyano, halo, haloalkyl or haloalkoxy; phenyl optionally substituted with alkyl, alkenyl, alkynyl, alkoxy, cyano, halo, haloalkyl or haloalkoxy; hydroxyalkyl; alkoxyalkyl; aminoalkyl; N-alkylaminoalkyl; N,N-dialkylaminoalkyl; N,N,N-trialkylammoniumalkyl; thioalkyl; L 13 -C(O)—OR 14′ , L 13 -P(O)—(OR 14′ ) 2 , or L 13 -S(O) 2 —OR 14′ , wherein L 13 is a bond or alkylene, and R 14′ is selected from the group consisting of hydrogen, alkyl and hydroxyalkyl; L 15 -O—C(O)—R 16′ , wherein L 15 is alkylene and R 16′ is alkyl or hydroxyalkyl; L 17 -C(O)—NR 18′ R 19′ , wherein L 17 is a bond or alkylene, and R 18′ and R 19′ are each independently selected from the group consisting of hydrogen, alkyl, and hydroxyalkyl; and L 20 -NR 21′ —C(O)—R 22′ , wherein L 20 is alkylene, R 21′ is hydrogen or alkyl, and R 22′ is alkyl or hydroxyalkyl; or

ii. R 10 and R 11 together with the carbon atom to which they are attached form a spirocyclic ring and/or R 12 and R 13 together with the carbon atom to which they are attached form a spirocyclic ring; wherein if any of substituents R 10 , R 11 , R 12 and R 13 do not form a ring, said substituents are each independently selected from the group consisting of hydrogen; alkyl; alkenyl; haloalkyl; alkynyl; oxoalkyl; cycloalkyl optionally substituted with alkyl, alkenyl, alkynyl, alkoxy, cyano, halo, haloalkyl or haloalkoxy; heterocyclyl optionally substituted with alkyl, alkenyl, alkynyl, alkoxy, cyano, halo, haloalkyl or haloalkoxy; 5-6 membered heteroaryl optionally substituted with alkyl, alkenyl, alkynyl, alkoxy, cyano, halo, haloalkyl or haloalkoxy; phenyl optionally substituted with alkyl, alkenyl, alkynyl, alkoxy, cyano, halo, haloalkyl or haloalkoxy; hydroxyalkyl; alkoxyalkyl; aminoalkyl; N-alkylaminoalkyl; N,N-dialkylaminoalkyl; N,N,N-trialkylammoniumalkyl; thioalkyl; L 13 -C(O)—OR 14′ , L 13 -P(O)—(OR 14′ ) 2 , or L 13 -S(O) 2 —OR 14′ , wherein L 13 is a bond or alkylene, and R 14′ is selected from the group consisting of hydrogen, alkyl and hydroxyalkyl; L 15 -O—C(O)—R 16′ , wherein L 15 is alkylene and R 16′ is alkyl or hydroxyalkyl; L 17 -C(O)—NR 18′ R 19′ , wherein L 17 is a bond or alkylene, and R 18′ and R 19′ are each independently selected from the group consisting of hydrogen, alkyl, and hydroxyalkyl; and L 20 -NR 21′ —C(O)—R 22′ , wherein L 20 is alkylene, R 21′ is hydrogen or alkyl, and R 22′ is alkyl or hydroxyalkyl; or

iii. one or more of R 10 , R 11 , R 12 and R 13 form a ring together with one or more of R 16 , R 17 , R 18 , or R 19 ; wherein if any of substituents R 10 , R 11 , R 12 and R 13 , do not form a ring, said substituents are each independently selected from the group consisting of hydrogen; alkyl; alkenyl; haloalkyl; alkynyl; oxoalkyl; cycloalkyl optionally substituted with alkyl, alkenyl, alkynyl, alkoxy, cyano, halo, haloalkyl or haloalkoxy; heterocyclyl optionally substituted with alkyl, alkenyl, alkynyl, alkoxy, cyano, halo, haloalkyl or haloalkoxy; 5-6 membered heteroaryl optionally substituted with alkyl, alkenyl, alkynyl, alkoxy, cyano, halo, haloalkyl or haloalkoxy; phenyl optionally substituted with alkyl, alkenyl, alkynyl, alkoxy, cyano, halo, haloalkyl or haloalkoxy; hydroxyalkyl; alkoxyalkyl; aminoalkyl; N-alkylaminoalkyl; N,N-dialkylaminoalkyl; N,N,N-trialkylammoniumalkyl; thioalkyl; L 13 -C(O)—OR 14′ , L 13 -P(O)—(OR 14′ ) 2 , or L 13 -S(O) 2 —OR 14′ , wherein L 13 is a bond or alkylene, and R 14′ is selected from the group consisting of hydrogen, alkyl and hydroxyalkyl; L 15 -O—C(O)—R 16′ , wherein L 15 is alkylene and R 16′ is alkyl or hydroxyalkyl; L 17 -C(O)—NR 18′ R 19′ , wherein L 17 is a bond or alkylene, and R 18′ and R 19′ are each independently selected from the group consisting of hydrogen, alkyl, and hydroxyalkyl; and L 20 -NR 21′ —C(O)—R 22′ , wherein L 20 is alkylene, R 21′ is hydrogen or alkyl, and R 22′ is alkyl or hydroxyalkyl; or

iv. R 10 , R 11 , R 12 and R 13 are each independently selected from the group consisting of alkyl; alkenyl; haloalkyl; alkynyl; oxoalkyl; cycloalkyl optionally substituted with alkyl, alkenyl, alkynyl, alkoxy, cyano, halo, haloalkyl or haloalkoxy; heterocyclyl optionally substituted with alkyl, alkenyl, alkynyl, alkoxy, cyano, halo, haloalkyl or haloalkoxy; 5-6 membered heteroaryl optionally substituted with alkyl, alkenyl, alkynyl, alkoxy, cyano, halo, haloalkyl or haloalkoxy; phenyl optionally substituted with alkyl, alkenyl, alkynyl, alkoxy, cyano, halo, haloalkyl or haloalkoxy; hydroxyalkyl; alkoxyalkyl; aminoalkyl; N-alkylaminoalkyl; N,N-dialkylaminoalkyl; N,N,N-trialkylammoniumalkyl; thioalkyl; L 13 -C(O)—OR 14′ , L 13 -P(O)—(OR 14 ) 2 , or L 13 -S(O) 2 —OR 14′ , wherein L 13 is a bond or alkylene, and R 14′ is selected from the group consisting of hydrogen, alkyl and hydroxyalkyl; L 15 -O—C(O)—R 16′ , wherein L 15 is alkylene and R 16′ is alkyl or hydroxyalkyl; L 17 -C(O)—NR 18′ R 19′ , wherein L 17 is a bond or alkylene, and R 18′ and R 19′ are each independently selected from the group consisting of hydrogen, alkyl, and hydroxyalkyl; and L 20 -NR 21′ —C(O)—R 22′ , wherein L 20 is alkylene, R 21′ is hydrogen or alkyl, and R 22′ is alkyl or hydroxyalkyl;

wherein as to R 17 and R 18 ,

i. R 17 together with R 18 optionally form a carbonyl; an exocyclic double bond optionally substituted with alkyl, alkenyl, alkynyl, aryl, cycloalkyl, heterocyclyl, or heteroaryl; or a 3- to 7-membered spiro ring containing zero, one, or two heteroatoms, optionally substituted with alkyl, alkenyl, alkynyl, aryl, cycloalkyl, heterocyclyl, or heteroaryl; or

ii. R 17 and R 18 are each independently selected from the group consisting of hydrogen; halo; fluoro; alkyl; alkenyl; alkynyl; haloalkyl; fluoroalkyl; alkyloxy; N-alkylamino; N,N-dialkylamino; cycloalkyl optionally substituted with alkyl, alkenyl, alkynyl, alkoxy, cyano, halo, haloalkyl or haloalkoxy; heterocycloalkyl optionally substituted with alkyl, alkenyl, alkynyl, alkoxy, cyano, halo, haloalkyl or haloalkoxy; heteroaryl optionally substituted with alkyl, alkenyl, alkynyl, alkoxy, cyano, halo, haloalkyl or haloalkoxy; phenyl optionally substituted with alkyl, alkenyl, alkynyl, alkoxy, cyano, halo, haloalkyl or haloalkoxy; arylalkyl optionally substituted with alkyl, alkenyl, alkynyl, alkoxy, cyano, halo, haloalkyl or haloalkoxy; hydroxyalkyl; alkoxyalkyl; aminoalkyl; N-alkylaminoalkyl; N,N-dialkylaminoalkyl; N,N,N-trialkylammoniumalkyl; L 1 -C(O)—OR 1′ , L 1 -P(O)—(OR 1′ ) 2 , or L 1 -S(O) 2 —OR 1′ , wherein L 1 is a bond or alkylene, and R 1′ is selected from the group consisting of hydrogen, alkyl and hydroxyalkyl L 2 -O—C(O)—R 2′ , wherein L 2 is a bond or alkylene, and R 2′ is alkyl or hydroxyalkyl; L 3 -C(O)—NR 3′ R 4′ , wherein L 3 is a bond or alkylene, R 3′ and R 4′ are each independently selected from the group consisting of hydrogen, alkyl, and hydroxyalkyl; L 4 -NR 5′ —C(O)—R 6′ , wherein L 4 is a bond or alkylene, and R 5′ is hydrogen or alkyl, R 6′ is alkyl or hydroxyalkyl; and alkylthio;

R 16 and R 19 are each independently selected from the group consisting of hydrogen, halo, alkyl, haloalkyl, fluoroalkyl, alkenyl, and alkoxy; and

at least one of bonds a and b in formula (Id) is a single bond and one of bonds a or b is optionally a double bond.

2. The phosphine ligand according to claim 1 , said ligand having a structure corresponding to a structure of a formula selected from the group consisting of formulae (I-1)-(I-42), or a salt thereof:

wherein

V 1 , V 2 , V 3 , and V 4 are each independently CR 1 or N;

V 5 , V 6 , V 7 , V 8 and V 9 are each independently CR 2 or N;

W 1 , W 2 , an W 3 are each independently selected from the group consisting of CR 1 , NR 1 , N and O;

W 4 is C or N;

W 5 is C or N;

W 6 , W 7 , W 8 and W 9 are each independently selected from the group consisting of CR 2 , NR 2 , N and O; and

ring C, at each occurrence, is a fused-aryl or fused-heteroaryl and is optionally substituted with R 1 and R 2 .

3. The phosphine ligand according to claim 1 , wherein R 16 and R 19 are hydrogen.

4. The phosphine ligand according to claim 1 , wherein R 17 and R 18 together with the carbon atom to which they are attached form a 3-, 4-, 5-, 6-, or 7-membered spirocyclic ring containing 0, 1, or 2 ring heteroatoms.

5. A phosphine ligand, said ligand having a structure corresponding to formula (I),

or a salt thereof,

wherein

Ar 1 and Ar 2 are each independently aryl or heteroaryl, and wherein Ar 1 and Ar 2 are each independently optionally substituted with one or more R 1 and R 2 , respectively;

R 1 and R 2 are independently selected at each occurrence from the group consisting of hydrogen; amino; hydroxyl; cyano; halo; alkyl; alkenyl; alkynyl; haloalkyl; haloalkoxy; oxoalkyl; alkoxy; aryloxy; heteroaryloxy; arylamino; heteroarylamino; alkylamino; dialkylamino; cycloalkyl optionally substituted with alkyl, alkenyl, alkynyl, alkoxy, cyano, halo, haloalkyl or haloalkoxy; cycloalkyloxy optionally substituted with alkyl, alkenyl, alkynyl, alkoxy, cyano, halo, haloalkyl or haloalkoxy; 5- or 6-membered heteroaryl optionally substituted with alkyl, alkenyl, alkynyl, alkoxy, cyano, halo, haloalkyl or haloalkoxy; phenyl optionally substituted with alkyl, alkenyl, alkynyl, alkoxy, cyano, halo, haloalkyl or haloalkoxy; hydroxyalkyl; hydroxyalkoxy; alkoxyalkyl; aminoalkyl; N-alkylaminoalkyl; N,N-dialkylaminoalkyl; N,N,N-trialkylammoniumalkyl; L 1 -C(O)—OR 1′ , L 1 -P(O)—(OR 1′ ) 2 , or L 1 -S(O) 2 —OR 1′ , wherein L 1 is a bond or alkylene, and R 1′ is selected from the group consisting of hydrogen, alkyl and hydroxyalkyl; L 2 -O—C(O)—R 2′ , wherein L 2 is a bond or alkylene, and R 2′ is alkyl or hydroxyalkyl; L 3 -C(O)—NR 3′ R 4′ , wherein L 3 is a bond or alkylene, and R 3′ and R 4′ are each independently selected from the group consisting of hydrogen, alkyl, and hydroxyalkyl; L 4 -NR 5′ —C(O)—R 6′ , wherein L 4 is a bond or alkylene, R 5′ is hydrogen or alkyl, and R 6′ is alkyl or hydroxyalkyl; sulfamoyl; N-(alkyl)sulfamoyl; N,N-(dialkyl)sulfamoyl; sulfonamide; sulfate; alkylthio; thioalkyl; and a ring containing an alkylene or —O—(CH 2 ) m —O— formed by the joining together of an two R 1 or an two R 2 or an R 1 and an R 2 , wherein m is 1, 2, 3 or 4;

X is a phosphine having a structure corresponding to a formula selected from the group consisting of:

or a salt thereof, wherein R″ is selected from the group consisting of oxygen, NR 20 , and C(R 20 ) 2 ;

R 20 is hydrogen, alkyl, aryl, heteroaryl, arylalkyl or heteroarylalkyl, wherein the aryl, heteroaryl, aryl of arylalkyl and heteroaryl of heteroarylalkyl are optionally substituted with alkyl, alkenyl, alkynyl, alkoxy, cyano, halo, haloalkyl or haloalkoxy; and

n is 0, 1, or 2.

6. The phosphine ligand of claim 2 , said ligand having a structure corresponding to formula (I-1),

or a salt thereof,

wherein

V 1 and V 4 are CR 1 , wherein R 1 is independently, at each occurrence, hydrogen or alkoxy;

V 2 and V 3 are CR 1 , wherein R 1 is independently, at each occurrence, hydrogen or alkoxy;

V 5 and V 9 are CR 2 , wherein R 2 is independently, at each occurrence, selected from the group consisting of hydrogen, alkoxy, alkyl, and dialkylamino;

V 6 and V 8 are CR 2 , wherein R 2 is independently, at each occurrence, hydrogen or alkoxy;

V 7 is CR 2 , wherein R 2 is hydrogen or alkyl; and

X is selected from the group consisting of phosphines of formulae 1-1, 1-2, 1-3, 1-4, 1-5, and 1-64

7. The phosphine ligand of claim 6 , wherein the ligand is selected from the group consisting of:

2,2,6,6-tetramethyl-1-(2′,4′,6′-triisopropylbiphenyl-2-yl)phosphinane;

2,2,6,6-tetramethyl-1-(2′,4′,6′-triisopropylbiphenyl-2-yl)phosphinan-4-one;

2,2,6,6-tetramethyl-1-(2′,4′,6′-triisopropylbiphenyl-2-yl)phosphinan-4-ol;

7,7,9,9-tetramethyl-8-(2′,4′,6′-triisopropylbiphenyl-2-yl)-1,4-dioxa-8-phosphaspiro[4.5]decane;

8,8,10,10-tetramethyl-9-(2′,4′,6′-triisopropylbiphenyl-2-yl)-1,5-dioxa-9-phospha-spiro[5.5]undecane;

3,3,8,8,10,10-hexamethyl-9-(2′,4′,6′-triisopropylbiphenyl-2-yl)-1,5-dioxa-9-phosphaspiro[5.5]undecane;

1-(2′-(dimethylamino)-6′-methoxybiphenyl-2-yl)-2,2,6,6-tetramethylphosphinan-4-one;

1-(2′,6′-bis(dimethylamino)biphenyl-2-yl)-2,2,6,6-tetramethylphosphinan-4-one;

1-(2′,6′-dimethoxybiphenyl-2-yl)-2,2,6,6-tetramethylphosphinan-4-one;

1-(2′,6′-diisopropoxybiphenyl-2-yl)-2,2,6,6-tetramethylphosphinan-4-one;

1-(2′-(dimethylamino)biphenyl-2-yl)-2,2,6,6-tetramethylphosphinan-4-one;

1-(biphenyl-2-yl)-2,2,6,6-tetramethylphosphinan-4-one;

1-(3,6-dimethoxybiphenyl-2-yl)-2,2,6,6-tetramethylphosphinan-4-one;

1-(3,6-dimethoxy-2′,4′,6′-trimethylbiphenyl-2-yl)-2,2,6,6-tetramethylphosphinan-4-one;

2,2,6,6-tetramethyl-1-(2′,4′,6′-triisopropyl-3,6-dimethoxybiphenyl-2-yl)phosphinan-4-one;

2,2,6,6-tetramethyl-1-(2′,4′,6′-triisopropyl-4,5-dimethoxybiphenyl-2-yl)phosphinan-4-one;

1-(3′,5′-dimethoxybiphenyl-2-yl)-2,2,6,6-tetramethylphosphinan-4-one;

1-(4′-tert-butylbiphenyl-2-yl)-2,2,6,6-tetramethylphosphinan-4-one;

6-methoxy-N,N-dimethyl-2′-(7,7,9,9-tetramethyl-1,4-dioxa-8-phosphaspiro[4.5]decan-8-yl)biphenyl-2-amine;

N 2 ,N 2 ,N 6 ,N 6 -tetramethyl-2′-(7,7,9,9-tetramethyl-1,4-dioxa-8-phosphaspiro[4.5]decan-8-yl)biphenyl-2,6-diamine;

8-(2′,6′-dimethoxybiphenyl-2-yl)-7,7,9,9-tetramethyl-1,4-dioxa-8-phosphaspiro[4.5]decane;

8-(2′,6′-diisopropoxybiphenyl-2-yl)-7,7,9,9-tetramethyl-1,4-dioxa-8-phosphaspiro[4.5]decane;

N,N-dimethyl-2′-(7,7,9,9-tetramethyl-1,4-dioxa-8-phosphaspiro[4.5]decan-8-yl)biphenyl-2-amine;

8-(biphenyl-2-yl)-7,7,9,9-tetramethyl-1,4-dioxa-8-phosphaspiro[4.5]decane;

8-(3,6-dimethoxybiphenyl-2-yl)-7,7,9,9-tetramethyl-1,4-dioxa-8-phosphaspiro[4.5]decane;

8-(3,6-dimethoxy-2′,4′,6′-trimethylbiphenyl-2-yl)-7,7,9,9-tetramethyl-1,4-dioxa-8-phosphaspiro[4.5]decane;

7,7,9,9-tetramethyl-8-(2′,4′,6′-triisopropyl-3,6-dimethoxybiphenyl-2-yl)-1,4-dioxa-8-phosphaspiro[4.5]decane;

7,7,9,9-tetramethyl-8-(2′,4′,6′-triisopropyl-4,5-dimethoxybiphenyl-2-yl)-1,4-dioxa-8-phosphaspiro[4.5]decane;

8-(3′,5′-dimethoxybiphenyl-2-yl)-7,7,9,9-tetramethyl-1,4-dioxa-8-phosphaspiro[4.5]decane;

8-(4′-tert-butylbiphenyl-2-yl)-7,7,9,9-tetramethyl-1,4-dioxa-8-phosphaspiro[4.5]decane; and

2,2,6,6-tetramethyl-1-(2′,4′,6′-triisopropyl-3,6-dimethoxybiphenyl-2-yl)phosphinane.

8. The phosphine ligand of claim 2 , said ligand having a structure corresponding to formula (I-8),

or a salt thereof,

wherein

V 1 and V 2 are each CR 1 , wherein R 1 is, at each occurrence, hydrogen;

V 7 and V 8 are each CR 2 , wherein R 2 is, at each occurrence, hydrogen;

V 9 is CR 2 , wherein R 2 is hydrogen;

ring C at each occurrence is an unsubstituted fused-phenyl; and

X is a phosphine having a structure corresponding to a formula selected from the group consisting of formulae 1-1, 1-3 and 1-5

9. The phosphine ligand of claim 8 , wherein said ligand is selected from the group consisting of:

2,2,6,6-tetramethyl-1-(2-(naphthalen-1-yl)phenyl)phosphinan-4-one; and

7,7,9,9-tetramethyl-8-(4-methyl-2-(naphthalen-1-yl)phenyl)-1,4-dioxa-8-phosphaspiro[4.5]decane.

10. The phosphine ligand of claim 2 , said ligand having a structure corresponding to formula (I-10),

or a salt thereof,

wherein

V 1 and V 2 are each CR 1 , wherein R 1 is, at each occurrence, hydrogen;

V 7 and V 8 are each CR 2 , wherein R 2 is, at each occurrence, hydrogen;

V 9 is CR 2 , wherein R 2 is hydrogen or alkoxy;

ring C at each occurrence is an unsubstituted fused-phenyl; and

X is a phosphine having a structure corresponding to a formula selected from the group consisting of formulae 1-1, 1-3, and 1-5

11. The phosphine ligand of claim 10 , wherein said ligand is selected from the group consisting of:

1-(1,1′-binaphthyl-2-yl)-2,2,6,6-tetramethylphosphinan-4-one;

1-(2′-methoxy-1,1′-binaphthyl-2-yl)-2,2,6,6-tetramethylphosphinan-4-one; 8-(1,1′-binaphthyl-2-yl)-7,7,9,9-tetramethyl-1,4-dioxa-8-phosphaspiro[4.5]decane; and

8-(2′-methoxy-1,1′-binaphthyl-2-yl)-7,7,9,9-tetramethyl-1,4-dioxa-8-phosphaspiro[4.5]decane.

12. The phosphine ligand of claim 2 , said ligand having a structure corresponding to formula (I-9),

or a salt thereof,

wherein

V 1 , V 2 , V 3 , and V 4 are each CR 1 , wherein R 1 , at each occurrence, is hydrogen;

V 5 , V 8 and V 9 are each CR 2 , wherein R 2 , at each occurrence, is hydrogen;

ring C is an unsubstituted fused-phenyl; and

X is a phosphine having a structure corresponding to a formula selected from the group consisting of formulae 1-1, 1-3, and 1-5

13. The phosphine ligand of claim 12 , wherein said ligand is selected from the group consisting of:

2,2,6,6-tetramethyl-1-(2-(naphthalen-2-yl)phenyl)phosphinan-4-one; and

7,7,9,9-tetramethyl-8-(2-(naphthalen-2-yl)phenyl)-1,4-dioxa-8-phosphaspiro[4.5]decane.

14. The phosphine ligand of claim 2 , said ligand having a structure corresponding to formula (I-2),

or a salt thereof,

wherein

W 1 and W 2 are each CR 1 , wherein R 1 , at each occurrence, is hydrogen;

W 3 and W 4 are each N;

V 5 , V 6 , V 7 , V 8 , and V 9 are each CR 2 , wherein R 2 , at each occurrence, is hydrogen; and

X is a phosphine having a structure corresponding to a formula selected from the group consisting of formulae 1-1, 1-3 and 1-5

15. The phosphine ligand of claim 14 , wherein said ligand is selected from the group consisting of:

2,2,6,6-tetramethyl-1-(1-phenyl-1H-pyrazol-5-yl)phosphinan-4-one; and

1-phenyl-5-(7,7,9,9-tetramethyl-1,4-dioxa-8-phosphaspiro[4.5]decan-8-yl)-1H-pyrazole.

16. The phosphine ligand of claim 2 , said ligand having a structure corresponding to formula (I-3),

or a salt thereof,

wherein

V 1 , V 2 , V 3 and V 4 are each CR 1 , wherein R 1 , at each occurrence, is hydrogen;

W 6 , W 7 , W 8 and W 9 are each CR 2 , wherein R 2 , at each occurrence, is hydrogen;

W 5 is N; and

X is a phosphine having a structure corresponding to a formula selected from the group consisting of formulae 1-1, 1-3 and 1-5

17. The phosphine ligand of claim 16 , wherein said ligand is selected from the group consisting of:

1-(2-(1H-pyrrol-1-yl)phenyl)-2,2,6,6-tetramethylphosphinan-4-one; and

1-(2-(7,7,9,9-tetramethyl-1,4-dioxa-8-phosphaspiro[4.5]decan-8-yl)phenyl)-1H-pyrrole.

18. The phosphine ligand of claim 2 , said ligand having a structure corresponding to formula (I-4),

or a salt thereof,

wherein

W 1 and W 2 are each CR 1 , wherein R 1 , at each occurrence, is hydrogen;

W 3 and W 4 are each N;

W 5 is C;

W 6 and W 9 are each CR 2 , wherein R 2 , at each occurrence, is substituted or unsubstituted phenyl;

W 7 is N;

W 8 is NR 2 , wherein R 2 , at each occurrence, is phenyl optionally substituted with alkyl, alkenyl, alkynyl, alkoxy, cyano, halo, haloalkyl or haloalkoxy; and

X is a phosphine having a structure corresponding to a formula selected from the group consisting of formulae 1-1, 1-3 and 1-5

19. The phosphine ligand of claim 18 , wherein said ligand is selected from the group consisting of:

2,2,6,6-Tetramethyl-1-(1′,3′,5′-triphenyl-1′H-1,4′-bipyrazol-5-yl)phosphinan-4-one;

1′1′,3′,5′-Triphenyl-5-(7,7,9,9-tetramethyl-1,4-dioxa-8-phosphaspiro[4.5]decan-8-yl)-1′H-1,4′-bipyrazole; and

1′,3′,5′-Triphenyl-5-(2,2,6,6-tetramethylphosphinan-1-yl)-1′H-1,4′-bipyrazole.

20. A catalyst composition comprising a transition metal catalyst precursor and a phosphine ligand according to claim 1 .

21. The catalyst composition according to claim 20 , wherein the transition metal catalyst precursor is selected from the group consisting of palladium, rhodium, ruthenium, platinum, gold, cobalt, iridium, copper and nickel.

22. The catalyst composition according to claim 21 , wherein the transition metal catalyst precursor contains palladium.

23. A catalyst composition comprising a palladium catalyst precursor and a phosphine ligand according to claim 5 .

24. A catalyst composition comprising a palladium catalyst precursor and a phosphine ligand according to claim 1 .

25. A heterogeneous catalyst composition comprising a ligand according to any one of claims 1 - 2 , 3 - 5 , and 6 - 19 covalently bonded to a solid catalyst support.

26. The phosphine ligand of claim 1 , wherein Ar 1 and Ar 2 are each aryl.

27. The phosphine ligand of claim 1 , wherein Ar 1 and Ar 2 are each substituted with one or more R 1 and R 2 , respectively.

28. The phosphine ligand of claim 1 , wherein R 1 is alkoxy and wherein R 2 is alkyl.

29. The phosphine ligand of claim 1 , wherein said ligand is 7,7,9,9-tetramethyl-8-(2′,4′,6′-triisopropyl-3,6-dimethoxybiphenyl-2-yl)-1,4-dioxa-8-phosphaspiro[4.5]decane.