Patent ID: 6617466
Filing Date: 2003-09-09
Classification: C07F,C08F,Y10S

Abstract:
A process for producing a compound represented by the general formula: wherein M is Zr, Hf or Ti;Mâ€² has the same meaning as M; (C5H4âˆ’xRx) is a cyclopentadienyl ring which is substituted with from zero to four substituent groups R, â€œxâ€  is 0, 1, 2, 3 or 4 denoting the degree of substitution, and each substituent group R is, independently, a radical selected from the group consisting of halogen radicals, C1-C20 hydrocarbyl radicals, substituted C1-C20 hydrocarbyl radicals where one or more hydrogen atoms is replaced by a halogen radical or (C5H4âˆ’xRx) is a cyclopentadienyl ring in which two adjacent R substituents are joined to form a ring to give an indenyl or tetrahydroindenyl ligand; (JRâ€²zâˆ’2) is a heteroatom ligand in which J is an element with a coordination number of three from Group V A or an element with a coordination number of two from Group VI A of the Periodic Table of Elements, each Râ€² is a radical selected from the group consisting of C1-C20 hydrocarbyl radicals, substituted C1-C20 hydrocarbyl radicals where one or more hydrogen atoms is replaced by a halogen radical, and â€œzâ€  is the coordination number of the element J; each Q is, independently, selected from the group consisting of hydride, methyl, ethyl, propyl, butyl, amyl, hexyl, heptyl, octyl, nonyl, decyl, cetyl, phenyl, chloro, bromo, fluoro, iodo, methoxy, ethoxy, propoxy, butoxy, phenoxy, methylphenoxy, dimethylamido, diethylamido, methylethylamido, dibutylamido, dipropylamido, diphenylamido, diphenylphosphido, dicyclohexylphosphido, diethylphosphido, and dimethylphosphido; Qâ€² has the same meaning as Q; T is a covalent bridging group selected from the group consisting of dialkyl, alkylaryl or diaryl silicon or germanium radicals; and â€œLâ€  is a neutral Lewis base where â€œwâ€  denotes the number 0 or 1; comprising reacting a Group IV B transition metal halide with a salt containing an anion of the formula ((C5H4âˆ’xRx)â€”Tâ€”(JRâ€²zâˆ’2))âˆ’2 and either two cations from Group I A or one cation from Group II A of the Periodic Table of Elements.