Patent ID: 6693156
Filing Date: 2004-02-17
Classification: C07C,C07F,C08F,Y10S

Abstract:
A methylene-bridged metallocene of formula (I): wherein:M is a transition metal belonging to group 3, 4, 5, 6 or to the lanthanide or actinide groups of the Periodic Table of the Elements; the substituents X, the same or different from each other, are monoanionic sigrna ligands selected from the group consisting of hydrogen, halogen, â€”R, â€”OR, â€”OSO2CF3, â€”OCOR, â€”SR, â€”NR2 and â€”PR2 groups, wherein the R substituents are linear or branched, C7-C20 aliphatic hydrocarbon, C3-C20 cycloalkyl, C6-C20 aryl, C7-C20 alkylaryl or C7-C20 arylalkyl radicals, optionally containing one or more atoms belonging to groups 13-17 of the Periodic Table of the Elements, and two R substituents may form a 5-7-mernbered ring; the substituents R1 and R2, the same or different from each other, are selected from the group consisting of linear or branched, C1-C20aliphatic hydrocarbon, C3-C20 cycloalkyl, C6-C20 aryl, C7-C20 alkylaryl and C7-C20 arylalkyl radicals, optionally containing one or more atoms belonging to groups 13-17 of the Periodic Table of the Elements, â€”OR, â€”SR, â€”NR2, N-pyrrolyl, N-indolyl, â€”PR2, â€”BR2 and â€”SiR3 groups, wherein the R substituents have the meaning reported above; or two adjacent R2 substituents form a ring having from 4 to 8 carbon atoms; p is an integer ranging from 0 to 3, being equal to the oxidation state of the metal M minus 2; m is an integer ranging from 0 to 2; n is an integer ranging from 0 to 4; with the proviso that, when m is 0, then n is different from 0.