Patent ID: 7718818

Claim:
A zirconium complex comprising zirconium and a chiral ligand of Formula III of at least about 50% enantiomeric purity wherein J is an optionally substituted linking chain of 2 to 4 members consisting of at least one carbon atom member and optionally one member selected from nitrogen and oxygen, of which no more than two carbon atom members are substituted as C(═O); the linking chain optionally fused through adjacent linking chain members to 1 or 2 rings or ring systems selected from the group consisting of a C 3 -C 8 cycloalkyl ring, a phenyl ring or a 1,2-naphthalenyl ring system, each ring or ring system optionally substituted; such that the attached nitrogen atoms are held in a stereospecific orientation with respect to J and each other as depicted; each R 6 is independently selected from the group consisting of halogen; NO 2 ; cyano; C 2 -C 5 alkoxycarbonyl; N(C 1 -C 4 alkyl) 2 ; CON(C 1 -C 4 alkyl) 2 ; C 1 -C 4 alkoxy; C 2 -C 5 alkylcarbonyloxy; C 2 -C 5 alkoxycarbonyloxy; optionally substituted phenylcarbonyloxy; (C 1 -C 4 alkyl)silyl; tri(C 1 -C 4 alkyl)siloxy; C 1 -C 4 alkyl optionally substituted with 1-3 phenyl rings; C 3 -C 6 cycloalkyl optionally substituted with C 1 -C 2 alkyl; adamantyl; or a phenyl ring, or a 5- or 6-membered heteroaromatic ring, each ring optionally substituted; and when two R 6 are attached to adjacent phenyl ring carbon atoms, said two R 6 may be taken together with the phenyl ring to form a naphthalene ring system optionally substituted on either ring of said naphthalene ring system; and each n is independently an integer from 0 to 4.