Process for the preparation of bridged, chiral metallocene catalysts of the bisindenyl type

Claim 2

The process as claimed in claim 1, wherein the base is selected from the group consisting of butyllithium, sodium hydride, sodium amide, potassium hydride, hexyllithium, methyllithium or elemental sodium or potassium.

Claim 3

The process as claimed in claim 1 or 2, wherein the solvent comprises an aliphatic or aromatic solvent.

Claim 4

The process as claimed in one or more of claims 1 - 3, wherein the solvent mixture comprises an aliphatic or aromatic solvent and an ethereal solvent.

Claim 5

The process as claimed in one or more of claims 1 - 4, wherein the ethereal solvent is selected from the group consisting of diethyl ether, tetrahydrofuran and diisopropyl ether.

Claim 6

The process as claimed in one or more of claims 1 - 5, wherein the aliphatic or aromatic solvent is selected from the group consisting of pentane, hexane, isohexane, toluene and xylene.

Claim 7

Use of the compound of the formula III prepared in accordance with the process as claimed in one or more of claims 1 - 6 in the synthesis of a metallocene of the formula IV whereby R¹ - R⁶ have the same meaning as in the formula I and M¹ is a metal selected from the group consisting of titanium, zirconium, hafnium, vanadium, niobium and tantalum.

Claim 8

A process for the preparation of a metallocene of the formula IV comprising, deprotonating a solution or suspension of a ligand system of the formula III in a solvent mixture containing a base to give a suspension of a metallated product of the ligand system, adding to the suspension of the metallated product a metal tetrahalide of the formula M¹Cl₄, and reacting the suspension of the metallated product and metal tetrahalide, whereby M¹ is a metal from the group consisting of titanium, zirconium, hafnium, vanadium, niobium and tantalum, R¹, R², R³, R⁴ and R⁵ are identical or different and are hydrogen, (C₁C₂₀)alkyl, (C₆-C₁₄)aryl, (C₁-C₁₀)alkoxy, (C₂-C₁₀)alkenyl, (C₇-C₂₀)arylaklyl, (C₇-C₂₀)alkylaryl, (C₆-C₁₀)-aryloxy, (C₁-C₁₀)fluoroalkyl, (C₆-C₁₀)haloaryl, (C₂-C₁₀)alkynyl, -SiR⁷₃ where R⁷ is (C₁-C₁₀)alkyl, halogen or heteroaromatic radicals having 5 or 6 ring members and optionally one or more hetero atoms, or adjacent radicals R¹-R⁴, together with the atoms connecting them, form one or more rings, R⁶ is where M² is carbon, silicon, germanium or tin, and R⁸ and R⁹ are identical or different and are hydrogen, (C₁-C₂₀)alkyl, (C₆-C₁₄)aryl, (C₁-C₁₀)alkoxy, (C₂-C₁₀)alkenyl, (C₇-C₂₀)arylakyl, (C₇-C₂₀)alkylaryl, (C₆-C₁₀)aryloxy, (C₁-C₁₀)fluoroalkyl, (C₆-C₁₀)haloaryl, (C₂-C₁₀)alkynyl, -SiR⁷₃, halogen or heteroaromatic radicals having 5 or 6 ring members and optionally one or more hetero atoms, or together with the atoms connecting them, form one or more rings, and p is 1, 2 or 3.

Claim 9

The process as claimed in claim 8, wherein the base is selected from the group consisting of butyllithium, sodium hydride, sodium amide, potassium hydride, hexyllithium, methyllithium or elemental sodium or potassium.

Claim 10

The process as claimed in claim 8 or 9, wherein the solvent comprises an aliphatic or aromatic solvent.

Claim 11

The process as claimed in one or more of claims 8 - 10, wherein the solvent mixture comprises an aliphatic or aromatic solvent and an ethereal solvent.

Claim 12

The process as claimed in one or more of claims 8 - 11, wherein the ehtereal solvent is selected from the group consisting of diethyl ether, tetrahydrofuran and diisopropyl ether.

Claim 13

The process as claimed in one or more of claims 8 - 12, wherein the ethereal solvent is added to the aliphatic or aromatic solvent when the reaction between the suspension of metallated product and the compound of formula II has been terminated.

Claim 14

The process as claimed in one or more of claims 8 - 13, wherein the aliphatic or aromatic solvent is selected from the group consisting of pentane, hexane, isohexane, toluene and xylene.

Claim 15

The process as claimed in one or more of claims 8 - 14, wherein the metal tetrahalide is ZrCl₄.

Claim 16

The process as claimed in one or more of claims 8 - 15, wherein a rac/meso mixture of the metallocene of the formula IV is separated by stirring the solid rac/meso mixture with tetrahydrofuran or methylene chloride.

Claim 17

The process as claimed in one or more of claims 8 - 16, wherein the metallocene is dimethylsilanediyl-bisindenyl zirconium dichloride or dimethylsilanediyl-bis(4,5-benzo-2-methylindenyl) zirconium dichloride.

Claim 18

Use of the metallocene of the formula IV prepared in accordance with the process as claimed in one or more of claims 8 - 17 in the preparation of isotactic polyolefins, polyolefin waxes and copolymers.