| 摘要 |
<p>Process for the manufacture of .alpha.,.beta.-unsaturated N-substituted carboxylic acid amides of the general formula (I) in which R1 represents H or CH3 R2 represents H or CH3, and Y represents a divalent straight-chain or branched organic radical having 2-30 carbon atoms, and R3 represents H or the radical of an amine of the formula -N(R4)(R5), in which R4 and R5 represent alkyl radicals having 1 to 4 carbon atoms, by reacting .beta.-substituted carboxylic acid amides of the formula (II) in which Z represents OH or the radical R60-, in which R is an alkyl radical having 1 to 4 carbon atoms, with amines of the general formula III at temperatures in the range of 100 to 200.degree.C, preferably 120 to 175.degree.C, with the elimination of ammonia, and heating the resulting N-substituted .beta.-hydroxycarboxylic or .beta.alkoxycarboxylic acid amides in the presence of catalysts, water or alcohol, respectively, being split off. The water is split off at temperatures of 100-250.degree.C with acidic catalysts such as phosphoric acid, or basic catalysts such as sodium hydroxide, and alcohol is split off at 70-150.degree.C with basic catalysts such as sodium or potassium hydroxide. The reaction product is separated by distillation, optionally in vacuo. .</p> |
