Patent ID: 6303823
Filing Date: 2001-10-16
Classification: C07C

Abstract:
A process for preparing .alpha.,.beta.-unsaturated ketones of the formula I ##STR6##in which R.sup.1 is a branched or unbranched cyclic or acyclic saturated or unsaturated aliphatic or araliphatic radical having 4 to 20 C atoms,and R.sup.2 is a branched or unbranched cyclic or acyclic saturated or unsaturated aliphatic or araliphatic radical having 1 to 10 C atoms,by reacting a ketone of the formula II ##STR7##in which R.sup.2 has the abovementioned meaning, with an aldehyde of the formula III ##STR8##in which R.sup.1 has the abovementioned meaning, wherein the ketone is heated under reflux in molar excess in the presence of a catalyst system consisting of dimethylamine or pyrrolidine and a carboxylic acid containing at least 2 C atoms, and the aldehyde of the formula III is slowly added to this mixture.