Methods for preparing aldehydes by self-aldol condensation

Details Methods for preparing aldehydes by self-aldol condensation Methods for preparing aldehydes by self-aldol condensation

C - Chemistry, Metallurgy

07

C

C07C 45/74 (2006.01) C07C 47/21 (2006.01)

Patent

CA 2721813

Methods for preparing self-aldol condensation products of prenyl aldehyde (3- methyl-2- butenal) by use of an amine catalyst under weakly acidic conditions at temperatures of 10 0C or higher are disclosed. Methods are disclosed for the selective formation of .alpha.-1,2-adducts and .gamma.- 1,2-adducts of prenyl aldehyde, and for the formation of specialty compositions useful in the flavor and fragrance industries.

L'invention porte sur des procédés pour préparer des produits d'autocondensation aldolique de prényl aldéhyde (3-méthyl-2-buténal) par utilisation d'un catalyseur amine dans des conditions faiblement acides à des températures de 10°C ou plus. L'invention porte sur des procédés pour la formation sélective de produits d'addition a-l,2 et de produits d'addition ?-1,2 de prényl aldéhyde, et pour la formation de compositions de spécialité utiles dans les industries des arômes et des parfums.

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