Patent ID: 7358381
Filing Date: 2008-04-15
Classification: C07F,C08F,Y10S

Abstract:
1. A process for preparing racemic metallocene complexes of the formula (I) is a divalent group is a divalent group and the substituents and indices have the following meanings: M is titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum or tungsten, R R R Y is oxygen R Z are identical or different and are each silicon, germanium, tin or carbon, R m is 1, 2, 3 or 4, which comprises reacting a transition metal complex of the formula (II) where X are identical or different and are each hydrogen, halogen, C n is an integer from 1 to 4 and corresponds to the valence of M minus 2, with cyclopentadienyl derivatives of the formula (III) where M and p is 1 when M and heating the resulting reaction mixture to a temperature in the range from −78 to +250° C.