US 9,000,200 B2 · Process for the preparation of metallocene complexes

Abstract

A process to prepared bridged bis(indenyl)ligands, comprising the step of reacting a 2-indenylpinacolyl borane compound with a bromosubstituted compound in the presence of a Pd catalyst and a base to form the corresponding bridged bis(indenyl) ligand. The process may further comprise the step of reacting a 2-bromo indene compound with pinacolborane in the presence of a Pd catalyst and a base to form the corresponding 2-indenylpinacolylborane compound. These bridged bis(indenyl)ligands may suitably be used in the preparation of metallocene complexes, such as 2,2′-bis(2-indenyl)biphenyl ZrCl2 and 1,2-bis(2-indenyl)benzene ZrCl2. These metallocene complexes may be used for the polymerization, optionally in the presence of a cocatalyst, of one or more α-olefins, preferably for the polymerization of ethylene.

Claims12

Dependent claims

A process for the preparation of a bridged bis(indenyl) ligand

comprising
reacting a 2-indenylpinacolylborane compound of formula (1)
wherein R1, R2, R3, R4, R5, R6 each independently stand for H, a hydrocarbon radical having 1-20 C-atoms, a halide, an alkoxy group having 1-6 C-atoms, an alkylsulphide, an amine, a Si or B containing group or a P-containing group
with a bromosubstituted compound of formula (2)
(Br)2—R (2)
wherein R stands for a bridging group containing at least two sp2-hybridised carbon atoms that are bonded to the indenyl groups at the 2-positions
in a solvent in the presence of a Pd catalyst and a base
to form the corresponding bridged bis(indenyl) ligand of formula (3)
wherein R and R1, R2, R3, R4, R5 are R6 as described above.

6 more elements

Dependencies are inferred from the claim text.

Process for the preparation of metallocene complexes

Life of this patent

Process for the preparation of metallocene complexes

Life of this patent

Abstract

Claims12