Patent ID: 7193099
Filing Date: 2007-03-20
Classification: C07F

Abstract:
1. A process for preparing racemic metallocene complexes by reacting transition metal complexes of the formula (I) where the substituents and indices have the following meanings: M is titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, tungsten or an element of transition group III of the Periodic Table and the lanthanides, X are identical or different and are each fluorine, chlorine, bromine, iodine, hydrogen, C n is an integer from 1 to 4 and corresponds to the valence of M minus 2, R R Y are identical or different and are each where R M with cyclopentadienyl derivatives of alkali metals or alkaline earth metals and heating the reaction mixture obtained in this way to a temperature in the range from −78 to 250° C.