Firmenich Sa

Christophe Saudan

Lionel Saudan

Francesco Santoro

Sylvia Joyeuse Adélaide Ada Saudan, Legal Representative

Michel Alfred Joseph Saudan, Legal Representative

The present invention relates to the field of catalytic hydrogenation and, more particularly, to a process for the reduction by hydrogenation, using molecular H, of a C-Cconjugated dienal into the corresponding deconjugated enal, characterized in that said process is carried out in the presence of a catalytic system comprising at least a base and at least one complex in the form of a rhodium complex comprising a C-Cbidentate diphosphine ligand (L2) coordinating the rhodium.

Hydrogenation of dienals with rhodium complexes under carbon monoxide free atmosphere

The present invention relates to the field of catalytic hydrogenation and, more particularly, to the use of specific ruthenium catalysts, or pre-catalysts, in hydrogenation processes for the reduction of ketones and/or aldehydes into the corresponding alcohol respectively. Said catalysts are ruthenium complexes comprising a tetradentate ligand (L4) coordinating the ruthenium with: &#x2014;two nitrogen atoms, each in the form of a primary or secondary amine (i.e. a NHor NH group) or N-alkyl imine functional groups (i.e. a C&#x2550;N group), and &#x2014;two sulfur atoms, each in the form of thioether functional groups.

Hydrogenation of esters or carbonyl groups with tetradentate amino/imino-thioether based ruthenium complexes

The present invention relates to processes for the reduction by hydrogenation, using molecular H2, of a substrate containing one or two esters, or lactones, functional groups into the corresponding alcohol, or diol, with the process being carried out in the presence of a base and at least one catalyst or pre-catalyst in the form of a ruthenium complex, wherein the ruthenium is coordinated by a diphosphine bidentate ligand (PP ligand) and a diamino bidentate ligand (NN ligand) that includes at least one substituted &#x3b1;-carbon and one primary amine as one of the coordinating atoms.

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Geneva, Switzerland

Christophe Saudan