Patent ID: 7285608
Filing Date: 2007-10-23
Classification: C07F,C08F,Y10S

Abstract:
1. A composition comprising a mixture of racemic and meso isomers of metallocene compounds having the formula: where L 1 and L 2 are identical or different ligands and are each a substituted mononuclear or polynuclear hydrocarbon radical selected from the group consisting of substituted cyclopentadienyl, indenyl, tetrahydroindenyl, azurenyl, fluorenyl, azapentalenyl, thiapentalenyl or oxapentalenyl, which form a sandwich structure with atom M 1 therebetween, R M R where R 40 and R 41 , are identical or different, with or without heteroatoms, when R 40 and R 41 are identical they are selected from the group consisting of a cyclic or non-cyclic alkyl group having from 2 to about 30 carbon atoms, a fluoroalkyl group of from 2 to about 10 carbon atoms, an alkoxy group of from 2 to about 10 carbon atoms, an aryloxy group of from 6 to about 10 carbon atoms, an alkenyl group of from about 3 to about 10 carbon atoms, an arylalkyl group of from 7 to about 40 carbon atoms, an alkylaryl group of from 7 to about 40 carbon atoms, a substituted or unsubstituted alkylsilyl or arylsilyl group and an arylalkenyl group of from 8 to about 40 carbon atoms, when R 40 and R 41 are different one of either R 40 and R 41 is selected from the group consisting of a cyclic or non-cyclic alkyl group having from 4 to about 40 carbon atoms, a fluoroalkyl group of from 2 to about 10 carbon atoms, an alkoxy group of from 2 to about 10 carbon atoms, an aryloxy group of from 6 to about 10 carbon atoms, an alkenyl group of from 3 to about 10 carbon atoms, an arylalkyl group of from 7 to about 40 carbon atoms, an alkylaryl group of from 7 to about 40 carbon atoms, a substituted or unsubstituted alkylsilyl or arylsilyl group and an arylalkenyl group of from 8 to about 40 carbon atoms, and the other of R 40 and R 41 is selected from the group consisting of a cyclic or non-cyclic alkyl group having from 1 to 40 carbon atoms, a fluoroalkyl group of from 2 to about 10 carbon atoms, an alkoxy group of from 2 to about 10 carbon atoms an aryloxy group of from 6 to about 10 carbon atoms, an alkenyl group of from 3 to about 10 carbon atoms, an arylalkyl group of from 7 to about 40 carbon atoms, an alkylaryl group of from 7 to about 40 carbon atoms, a substituted or unsubstituted alkylsilyl or arylsilyl group and an arylalkenyl group of from 8 to about 40 carbon atoms, M wherein the mixture of racemic and meso isomers as synthesized has a weight ratio of racemic to meso isomers of greater than 5:1.