.alpha.-Alkylacroleins are prepared by reacting an alkanal with formaldehyde and a secondary amine in the presence of a carboxylic, dicarboxylic or polycarboxylic acid in certain molar ratios within a pH range of from 2.5 to 7 and at from 0.degree. to 150.degree. C. The .alpha.-alkylacroleins which can be prepared by the process described are valuable starting materials for dyes, drugs and pest control agents.
通过在某些摩尔比例下,在pH范围为2.5至7之间,在0°C至150°C的条件下,将烷醛与
甲醛和二级胺在
羧酸、二
羧酸或多
羧酸的存在下反应,可以制备.alpha.-烷基
丙烯醛。通过所述方法制备的.alpha.-烷基
丙烯醛是
染料、药物和
杀虫剂的有价值的起始材料。