温控两相酸性聚合型离子液体催化胺醛缩合反应

为降低催化剂流失率,以聚乙二醇为主链、双键取代咪唑型离子液体为交联剂,采用自由基聚合方式设计合成出酸性聚合型离子液体。该离子液体可与甲苯形成优良的温控两相体系,并用于苯胺和苯甲醛的缩合反应。结果表明,聚合离子液体具有催化活性高、流失量小、回收方便的优点。产物N-亚苄基苯胺收率93.4%,离子液体平均单次流失率约2.5%。底物拓展试验表明,该温控体系对含不同取代基的芳胺和芳醛缩合反应具有良好的普适性,产物收率57.2%~82.9%。

Thermoregulated Biphasic Acidic Polymeric Ionic Liquid Catalyzed Amine Aldehyde Condensation Reaction

Acidic polymeric ionic liquid was synthesized with polyethylene glycol as the main chain and imidazole-based ionic liquid as crosslinking agent through the free radical polymerization to reduce the loss rate of catalyst. The thermoregulated biphasic system comprised of ionic liquid and toluene was used for the condensation reaction of aniline and benzaldehyde. The catalytic results show that the catalyst has advantages of high catalytic activity, small loss and easy recycling. The yield of N-benzalaniline is 93.4%, and the average loss rate of ionic liquid is about 2.5%. Further tests show that the system has good universality for the various substrates, and the yield of the products is 57.2%~82.9%.