2-Substituted bisindenyl-metallocenes, process for their preparation and their use as catalysts for the polymerization of olefins

Claim 1

A process for the preparation of a compound of the formula I in which M¹   is a metal from group IVb, Vb or VIb of the Periodic Table, R¹ and R²   are identical or different and are a hydrogen atom, a C₁-C₁₀-alkyl group, a C₁-C₁₀-alkoxy group, a C₆-C₁₀-aryl group, a C₆-C₁₀-aryloxy group, a C₂-C₁₀-alkenyl group, a C₇-C₄₀-arylalkyl group, a C₇-C₄₀-alkylaryl group, a C₈-C₄₀-aryl-alkenyl group or a halogen atom, R³ and R⁴   are identical or different and are a hydrogen atom, a halogen atom, a C₁-C₁₀-alkyl group, which may be halogenated, a C₆-C₁₀-aryl group, an -NR₂¹⁰, -SR¹⁰, -OSiR₃¹⁰, SiR₃¹⁰ or -PR₂¹⁰ radical in which R¹⁰ is a halogen atom, a C₁-C₁₀-alkyl group or a C₆-C₁₀-aryl group, R⁵ and R⁶   are identical or different and are as defined for R³ and R⁴, with the proviso that R⁵ and R⁶ are not hydrogen, R⁷   is =BR¹¹, =AlR¹¹, -Ge-, -Sn-, -O-, -S-, =SO, =SO₂, =NR¹¹, =CO, =PR¹¹ or =P(O)R¹¹, where R¹¹, R¹² and R¹³   are identical or different and are a hydrogen atom, a halogen atom, a C₁-C₁₀-alkyl group, C₁-C₁₀-fluoroalkyl group, a C₆-C₁₀-aryl group, a C₆-C₁₀-fluoroaryl group, a C₁-C₁₀-alkoxy group, a C₂-C₁₀-alkenyl group, a C₇-C₄₀-arylalkyl group, a C₈-C₄₀-arylalkenyl group or a C₇-C₄₀-alkylaryl group, or R¹¹ and R¹² or R¹¹ and R¹³, in each case with the atoms connecting them, form a ring, M²   is silicon, germanium or tin, R⁸ and R⁹   are identical or different and are as defined for R¹¹, and m and n   are identical or different and are zero, 1 or 2, m plus n being zero, 1 or 2, which comprises reacting a compound of the formula II where R³-R⁹, m and n are as described in the formula I, and M³ is an alkali metal, preferably lithium, a) with a compound of the formula III M¹X₄   (III) in which M¹ is as defined in the formula I, and X is a halogen atom, preferably chlorine, or b) with a compound of the formula IIIa M¹X₄L₂   (IIIa) in which M¹ and X are as defined above, and L is a donor ligand, and, if desired, derivatizing the resultant reaction product.