Patent ID: 7465818
Filing Date: 2008-12-16
Classification: C07F,C08F,Y10S

Abstract:
1. A process for the racemoselective preparation of ansa-metallocene complexes of the formula (I), which comprises reacting a ligand starting compound of the formula (II) with a transition metal compound of the formula (III) where R R R T, T′ are identical or different and are each a divalent organic group which has from 1 to 40 carbon atoms and together with the cyclopentadienyl ring forms at least one further saturated or unsaturated, substituted or unsubstituted ring system which has a ring size of from 5 to 12 atoms, where T and T′ may contain the heteroatoms Si, Ge, N, P, As, Sb, O, S, Se or Te within the ring system fused to the cyclopentadienyl ring, A is a bridge consisting of a divalent atom or a divalent group, Z is a bridge consisting of a divalent atom or a divalent group, E is P, As or Sb, M M p is 1 in the case of doubly positively charged metal ions or is 2 in the case of singly positively charged metal ions or metal ion fragments, the radicals X are identical or different and are each an organic or inorganic radical which can be substituted by a cyclopentadienyl anion, and LB is an uncharged Lewis-base ligand.