Bayer Intellectual Property Gmbh

Franco Doro

Pieter Ooms

Christoph Gürtler

Johann Rechner

Thomas Ernst Müller

Friedhelm Risse

Angelina Prokofieva

Walter Leitner

Aurel Wolf

Burkhard Köhler

Thomas Ernst MÜLLER

The invention relates to bimetallic complexes in which the ligand contains a salophen unit which complexes copper, manganese or cobalt and a phenanthroline unit which complexes palladium and the two systems are linked by a continuous conjugated system. The invention further relates to the use of these bimetallic complexes as catalysts for the oxidative carbonylation of aromatic hydroxy compounds to form diaryl carbonates, a process for preparing diaryl carbonates using the bimetallic complex as catalyst and also diaryl carbonates prepared by oxidative carbonylation of aromatic hydroxy compounds using the bimetallic complexes of the invention as catalysts.

Bimetallic complexes and the use thereof in producing diaryl carbonate

The present invention relates to a process for continuously preparing diaryl carbonates from dialkyl carbonates and at least one monohydroxyl compound in the presence of catalysts, and to the use thereof for preparation of polycarbonates. The alkylene glycol obtained in the preparation of the dialkyl carbonate used is recycled by oxidative carbonylation with carbon monoxide in the presence of a catalyst to give the cyclic alkylene carbonate which is in turn converted to the dialkyl carbonate. More particularly, the process utilizes the alkylene glycol obtained for the diphenyl carbonate preparation process (DPC process).

Process for preparing diaryl carbonates from dialkyl carbonates

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Aachen, Germany

Franco Doro