Patent ID: RE39561

Claim:
A compound of the formula I for preparing essentially isotactic olefin polymers in which M 1 is a metal from group IVb, Vb or VIb of the Periodic Table R 1 and R 2 are identical or different and are a hydrogen atom, 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 a hydrogen atom, a halogen atom, a C 2 -C 10 - alkyl group, a C 1 -C 10 - alkyl group which is halogenated, a C 6 -C 10 - aryl group, an —NR 2 15 , —SR 15 , —OSiR 3 15 , —SiR 3 15 or —PR 2 15 radical in which R 15 is a halogen atom, a C 1 -C 10 - alkyl group or a C 6 -C 10 - aryl group, R 3 and R 4 are identical or different and are is a hydrogen atom, a halogen atom, a C 1 -C 10 -alkyl group, which is optionally halogenated, a C 6 -C 10 -aryl group, an —NR 2 15 , —SR 15 , —OSiR 3 15 , —SiR 3 15 or —PR 2 15 radical in which R 15 is a halogen atom, a C 1 -C 10 -alkyl group or a C 6 -C 10 -aryl group, R 5 and R 6 are identical or different and are as defined for R 3 and R 4 , with the proviso that R 5 and R 6 are not hydrogen, R 7 is ═BR 11 , ═AlR 11 , —Ge—, —Sn—, —O—, —S—, ═SO, ═SO 2 , ═NR 11 , ═CO, ═PR 11 or ═P(O)R 11 , where R 11 , R 12 and R 13 are identical or different and are a hydrogen atom, a halogen atom, a C 1 -C 10 -alkyl group, a C 1 -C 10 -fluoroalkyl group, a C 6 -C 10 -aryl group, a C 6 -C 10 -fluoroaryl group, a C 1 -C 10 -alkoxy 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 a pair of substituents R 11 and R 12 or R 11 and R 13 in each case with the atoms connecting them, form a ring, M 2 is silicon, germanium or tin, R 8 and R 9 are identical or different and are as defined for R 11 m and n are identical or different and are zero, 1 or 2, m plus n being zero, 1 or 2, the radicals R 10 are identical or different and are as defined for R 11 , R 12 and R 13 , rings A are saturated or aromatic, p is 8 , when rings A are saturated, and p is 4 , when rings A are aromatic.