Patent ID: 7635783
Filing Date: 2009-12-22
Classification: C07F,C08F,Y10S

Abstract:
1. A process for meso-selective preparation of ansa-metallocene complexes of formula (I): which comprises reacting a ligand starting compound of formula (II): with a transition metal compound of formula (III): where R R R T, T′ are identical or different and are each a divalent organic group comprising from 1 to 40 carbon atoms, and together with the cyclopentadienyl rings form at least one further saturated or unsaturated, substituted or unsubstituted ring system comprising from 5 to 12 atoms, where T and T′ optionally comprises at least one heteroatom selected from Si, Ge, N, P, As, Sb, O, S, Se or Te; A is a bridge consisting of a divalent atom or a divalent group; M X are identical or different and are each an organic or inorganic radical which is able to be replaced by a cyclopentadienyl anion; x is a natural number from 1 to 4; M p is 1 when M LB is an uncharged Lewis base ligand; and y is a natural number from 0 to 6.