Production of dihydronepetalactone by hydrogenation of...

C - Chemistry – Metallurgy – 07 – D

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C07D 311/94 (2006.01)

Patent

CA 2673047

This invention provides a process for producing dihydronepetalactone using mixtures comprising both trans-cis nepetalactone and cis-trans nepetalactone. A reaction mixture comprising trans-cis nepetalactone and cis-trans nepetalactone is first contacted with hydrogen in the presence of at least one hydrogenation catalyst under conditions that optimize the preferential conversion of trans-cis nepetalactone to dihydronepetalactone. Cis-trans nepetalactone is subsequently converted to dihydronepetalactone by contact with hydrogen in the presence of at least one hydrogenation catalyst.

La présente invention concerne un procédé permettant de produire de la dihydronépétalactone à l'aide de mélanges contenant à la fois de la trans-cis népétalactone et de la cis-trans népétalactone. Le procédé selon l'invention consiste : à mettre tout d'abord un mélange réactionnel contenant de la trans-cis népétalactone et de la cis-trans népétalactone en contact avec de l'hydrogène, en présence d'au moins un catalyseur d'hydrogénation et dans des conditions qui optimisent la conversion préférentielle de la trans-cis népétalactone en dihydronépétalactone; et à convertir ensuite la cis-trans népétalactone en dihydronépétalactone, en la mettant en contact avec de l'hydrogène en présence d'au moins un catalyseur d'hydrogénation.

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