Patent ID: 7619106
Filing Date: 2009-11-17
Classification: B01J,C07B,C07F,C08F,Y10S

Abstract:
1. A process for preparing partially hydrogenated, racemic ansa-metallocene complexes of formula Via by reacting bridged or unbridged transition metal-aromatic 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 R R Y, Y  or ═BR where R M m is 0, 1, 2 or 3, or Y is nonbridging and represents two radicals R′ and R″ where R′, R″ are as defined for R with cyclopentadienyl derivatives of the formula II where is a divalent group and is a divalent group and the substituents and indices have the following meanings: R Z is a -[Q(R Q may be identical or different and are each silicon, germanium, tin or carbon, R q is 1, 2, 3 or 4; R M p is 1 when M and heating the resulting reaction mixture to a temperature in the range from minus 78° C. to 250° C., with or without addition of free radicals or free radical formers, to give a complex of the formula III and at least partially hydrogenating III by means of hydrogen in the presence of a suitable catalyst to a complex of formula VI and replacing the bridged phenoxide-analogous ligand or the two phenoxide-analogous ligands to give the complexes of formula VIa where is a divalent group and is a divalent group and Hal is fluorine, chlorine, bromine or iodine.