Patent ID: 6090975
Filing Date: 2000-07-18
Classification: C07C

Abstract:
A process for the preparation of a 2-acetylcarboxylic ester by reacting an acetoacetic ester with an aldehyde, followed by hydrogenation, which comprisesa) reacting an acetoacetic ester having 1 to 6 C atoms in the alkyl moiety with an aliphatic aldehyde having 1 to 12 C atoms at 0 to 40.degree. C. in the presence of a condensation catalyst,b) removing, after condensation, the water of reaction formed and unreacted starting materials from the reaction mixture, subsequentlyc) hydrogenating the remaining residue in substance at 20 to 160.degree. C. and a pressure of 1 to 100 bar in the presence of a hydrogenation catalyst, the temperature in the first hydrogenation phase being between 20 and 90.degree. C. and the temperature in the second phase being increased to 50 to 160.degree. C., depending on the starting temperature,d) and subsequently isolating the 2-acetyl-carboxylic ester in question from the reaction mixture by distillation.