Patent ID: 6936563
Filing Date: 2005-08-30
Classification: C07F,C08F

Abstract:
1. A complex of the formula I a or I b, where the variables are defined as follows: M is selected from the group consisting of Ti, Zr, Hf, V, Nb and Ta; y corresponds to the oxidation state of M minus 1; z corresponds to the oxidation state of M minus 2; Nu is selected from the group consisting of O, S and N—R X are identical or different and are selected from the group consisting of a halogen, a C R a hydrogen, a substituted C a substituted C a substituted C a C an unsubstituted C a substituted C a substituted C a C a C a C a halogen, a substituted C a C a SiR an unsubstituted five- member nitrogen-containing heteroaryl radical, a substituted five-member nitrogen-containing hetereoaryl radical, an unsubstituted six-membered nitrogen-containing heteroaryl radical wherein one or more substituents are identical or different and are selected from the group consisting of a substituted C a substituted C a C a C a C a halogen, a C a C a SiR where adjacent radicals R wherein R