Saudi Basic Industries Corporation

Christian Gorl

Helmut G Alt

Abdulaziz Hamad Al-Humydi

Atieh Aburaqabah

A process comprising reacting a 2-indenylboranic acid (ester) with a bromosubstituted compound in the presence of the Pd catalyst bis(triphenylphosphin)palladium dichloride and a base to form the corresponding bridged bis(indenyl) ligand. Where the 2-indenylboranic acid (ester) is the pinacolester of 2-indenylboranic acid, the process may further comprise 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. Bridged bis(indenyl)ligands may suitably be used in the preparation of metallocene complexes, such as 2,2'-bis(2-indenyl)biphenyl ZrCland 1,2-bis (2-indenyl)benzene ZrCl. These metallocene complexes may be used for the polymerization, optionally in the presence of a cocatalyst, of one or more &#x3b1;-olefins, preferably for the polymerization of ethylene.

Process for the preparation of metallocene complexes

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 ZrCland 1,2-bis(2-indenyl)benzene ZrCl. These metallocene complexes may be used for the polymerization, optionally in the presence of a cocatalyst, of one or more &#x3b1;-olefins, preferably for the polymerization of ethylene.

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Bayreuth, Germany

Christian Gorl