Metallocenes having bicyclic cyclopentadiene derivatives as ligands, processes for their preparation and their use as catalysts

Claim 1

A process for the preparation of a compound of the formula XI ##STR10## wherein M 1 is a metal from the group comprising titanium, zirconium, hafnium, vanadium, niobium and tantalum, the radicals R 1 are identical or different and are hydrogen a C 1 -C 10 -alkyl group, a C 6 -C 10 -aryl group, a C 7 -C 15 -arylalkyl group or a C 2 -C 10 -alkenyl group, the radicals R 2 are identical or different and are a C 1 -C 10 -alkyl group, a C 1 -C 10 -alkoxy group, a C 6 -C 10 -aryl group, a C 6 -C 10 -aryloxy group, a C 2 -C 10 -alkenyl group, a C 7 -C 40 -arylalkyl group, a C 7 -C 40 -alkylaryl group, a C 8 -C 40 -arylalkenyl group or a halogen atom, R 3 is ##STR11## in which M 2 is silicon, germanium or tin, R 4 and R 5 are identical or different and are a hydrogen atom, a halogen atom, a C 1 -C 10 -alkyl group, a C 6 -C 10 -aryl group, a C 2 -C 10 -alkenyl group, a C 7 -C 40 -arylalkyl group, a C 8 -C 40 -arylalkenyl group or a C 7 -C 40 -alkylaryl group or R 4 and R 5 , together with the atom which binds them, form a ring and p is 1, 2 or 3, and n is an integer from 2 to 18, comprising reacting a compound of the formula II ##STR12## wherein n is defined above, with an alkali metal or alkaline earth metal salt of a malonic ester, reacting the intermediate formed, without isolation, with a compound R 1 -X, in which R 1 has the stated meaning and X is a nucleophilic leaving group, and converting the reaction product by decarboxylation into a lactone of the formula IV ##STR13## wherein n and R 1 are defined above, which is subjected to a rearrangement reaction to give the corresponding enone of formula (V) ##STR14## wherein n and R 1 are defined above and then either step a) reducing by reducing agents or step b) reacting by the "Bamford-Stevens method"; with steps a) or b) followed by reacting with an alkali metal salt, then reacting with a compound M 3 -R 1 in which M 3 is an alkali metal and R 1 is alkyl or hydrogen and then reacting with a compound of the formula M 1 X 4 in which X is halogen and M 1 is defined above, to give the compound of the formula XI.