Patent ID: 6127563
Filing Date: 2000-10-03
Classification: C07F,Y02P,Y10S

Abstract:
A process for preparing a compound according to the formula: MX.sub.2 D(L').sub.k the steps of the process comprising contacting in any order, in an inert diluent, and optionally in the presence of a Lewis base, a Group 4 metal complex corresponding to the formula, M.sup.1 X.sub.4 (L').sub.k with a reducing agent to prepare a dimeric compound corresponding to the formula: ##STR7## and subsequently or simultaneously contacting said dimeric compound with the diene D, whereinM is titanium, zirconium or hafnium in the +2 formal oxidation state;M.sup.1 is titanium, zirconium or hafnium in the +4 formal oxidation state;M.sup.2 is titanium, zirconium or hafnium in the +3 formal oxidation state;D is a neutral, substituted derivative of 1,3-butadiene, substituted with one or more hydrocarbyl groups, silyl groups, hydrocarbylsilyl groups, silylhydrocarbyl groups, or mixtures thereof, at least one of said substituents being located at the 1- or 4-position, said D having from 5 up to 40 atoms other than hydrogen;X independently each occurrence is a monovalent anionic leaving group of up to 50 atoms other than hydrogen, and optionally, two X groups (excluding bridging anion X groups) are joined together thereby forming a divalent anionic leaving group;L' is a Lewis base, andk is a number from 0 to 3.