Asymmetrical ligands
View Patent ↗A ligand of formula (I′) wherein L is a divalent bridge selected from —R′ 2 C—, —R′ 2 C—CR′ 2 —, —R′ 2 Si—, —R′ 2 Si—SiR′ 2 —, —R′ 2 Ge—, wherein each R′ is independently a hydrogen atom, C 1-20 -hydrocarbyl, tri(C 1-20 -alkyl)silyl, C 6-20 -aryl, C 7-20 -arylalkyl or C 7-20 -alkylaryl; R 2 and R 2 ′ are each independently a C 1-20 hydrocarbyl radical; R 5′ is a C 1-20 hydrocarbyl group; R 6 , R 6′ , R 7 and R 7′ are each independently hydrogen or a C 1-20 hydrocarbyl group; Ar and Ar′ are independently an aryl or heteroaryl group having up to 20 carbon atoms; each R 1 is a C 1-20 hydrocarbyl group or two R 1 groups on adjacent carbon atoms taken together can form a fused 5 or 6 membered non aromatic ring with the Ar group; and each R 4 is a C 1-20 hydrocarbyl group; and the dotted lines represent a double bond present in between carbons 1 and 2 or 2 and 3 of the indenyl ring.
1. A ligand of formula (II′) or (II);
wherein
L is a divalent bridge selected from —R′ 2 C—, —R′ 2 C—CR′ 2 —, —R′ 2 Si—, —R′ 2 Si—SiR′ 2 —, —R′ 2 Ge—, wherein each R′ is independently a hydrogen atom, C 1-20 alkyl, C 3-10 cycloalkyl, tri(C 1-20 -alkyl)silyl, C 6-20 -aryl, C 7-20 arylalkyl or C 7-20 alkylaryl;
each R 2 or R 2′ is a C 1-10 alkyl group;
R 5′ is a Z′R 3′ group;
R 6 is hydrogen or a C 1-10 alkyl group;
R 6′ is a C 1-10 alkyl group or C 6-10 aryl group;
R 7 is hydrogen, a C 1-6 alkyl group or ZR 3 group;
R 7′ is hydrogen or a C 1-10 alkyl group;
Z and Z′ are independently O or S;
R 3′ is a C 1-10 alkyl group, or a C 6-10 aryl group optionally substituted by one or more halo groups;
R 3 is a C 1-10 -alkyl group;
n is 0 to 4;
and each R 1 is a C 1-20 hydrocarbyl group.
2. A ligand as claimed in claim 1 in which R 7 and R 7′ are hydrogen and R 2 and R 2′ are the same.
3. A ligand as claimed in claim 1 , of formula (III′) or (III):
wherein
L is a divalent bridge selected from —R′ 2 C— or —R′ 2 Si— wherein each R′ is independently a hydrogen atom, C 1-20 alkyl or C 3-10 cycloalkyl;
R 6 is hydrogen or a C 1-10 alkyl group;
R 6′ is a C 1-10 alkyl group or C 6-10 aryl group;
R 7 is hydrogen, C 1-6 alkyl or OC 1-6 alkyl;
Z′ is O or S;
R 3′ is a C 1-10 alkyl group, or C 6-10 aryl group optionally substituted by one or more halo groups;
n is 0 to 4; and
each R 1 is a C 1-10 alkyl group.
4. A ligand as claimed in claim 1 , of formula (IV′) or (IV)
wherein
each R′ is independently a hydrogen atom, C 1-20 alkyl or C 3-7 cycloalkyl;
R 6 is hydrogen or a C 1-10 alkyl group;
R 6′ is a C 1-10 alkyl group or C 6-10 aryl group;
R 7 is hydrogen, C 1-6 alkyl or OC 1-6 alkyl;
Z′ is O or S;
R 3′ is a C 1-10 alkyl group, or C 6-10 aryl group optionally substituted by one or more halo groups;
n is 0, 1 or 2; and
each R 1 is a C 3-8 alkyl group.
5. A ligand as claimed in claim 1 , of formula (V) or (V′)
wherein
R′ is independently a C 1-6 alkyl or C 3-10 cycloalkyl;
R 1 is C 3-8 alkyl;
R 6 is hydrogen or a C 3-8 alkyl group;
R 6′ is a C 3-8 alkyl group or C 6-10 aryl group;
R 3′ is a C 1-6 alkyl group, or C 6-10 aryl group optionally substituted by one or more halo groups; and
n is 0, 1 or 2.
6. A ligand as claimed in claim 1 , wherein the ligand is selected from the group consisting of:
(6-tert-Butyl-5-methoxy-2-methyl-4-phenyl-1H-inden-1-yl)-(6-tert-butyl-2-methyl-4-phenyl-1H-inden-1-yl)dimethylsilane;
(6-tert-Butyl-5-methoxy-2-methyl-4-phenyl-1H-inden-1-yl)[4-(4-tert-butylphenyl)-2-methyl-1H-inden-1-yl]dimethylsilane;
[6-tert-Butyl-4-(3,5-di-tert-butylphenyl)-2-methyl-1H-inden-1-yl]-(6-tert-butyl-5-methoxy-2-methyl-4-phenyl-1H-inden-1-yl)dimethylsilane;
[4-(4-tert-Butylphenyl)-2-methyl-1H-inden-1-yl][6-isopropyl-2-methyl-5-(pentafluoro phenoxy)-4-phenyl-1H-inden-1-yl]dimethylsilane;
(2-methyl-4-phenyl-5-methoxy-6-tert-butyl-1H-inden-1-yl)[2,7-dimethyl-4-(3,5-di-tert-butylphenyl)-1H-inden-1-yl]dimethylsilane;
(2-methyl-4-phenyl-5-methoxy-6-tert-butyl-1H-inden-1-yl)[2,4-dimethyl-7-(3,5-di-tert-butylphenyl)-1H-inden-1-yl]dimethylsilane;
[2-Methyl-4-phenyl-5-methoxy-6-tert-butyl-1H-inden-1-yl]-[2-methyl-4-(3,5-di-tertbutylphenyl)-7-methoxy-1H-inden-1-yl]dimethylsilane;
[6-tert-Butyl-4-(4-tert-butylphenyl)-5-methoxy-2-methyl-1H-inden-1-yl][4-(4-tert-butylphenyl)-2-methyl-1H-inden-1-yl]dimethylsilane;
[6-tert-Butyl-4-(3,5-di-tert-butylphenyl)-5-methoxy-2-methyl-1H-inden-1-yl][4-(4-tert-butylphenyl)-2-methyl-1H-inden-1-yl]dimethylsilane; and
(6-tert-Butyl-5-isobutoxy-2-methyl-4-phenyl-1H-inden-1-yl)[4-(4-tert-butylphenyl)-2-methyl-1H-inden-1-yl]dimethylsilane.