Racemic metallocene complexes and their preparation

摘要

Metallocene complexes of the formula I I where M is titanium, zirconium, hafnium, vanadium, niobium or tantalum, X inter alia is fluorine, chlorine, bromine, iodine or hydrogen, R1 to R6 inter alia are each hydrogen or C1-C10-alkyl, Z is silicon, germanium, tin or carbon, Y1 and Y2 are each R9 to R16 inter alia are each hydrogen or C1-C10-alkyl, and u, v and w are each an integer from 0 to 7, with the proviso that the sum u+v+w is >/=2, and cyclopentadienyl compounds of the formula II II and cyclopentadienyl compound of the formula III III as intermediates.