室温离子液体中催化合成肉桂酸苄酯

Catalytic Synthesis of Benzyl Cinnamate in Room Temperature Ionic Liquid

研究离子液体中肉桂酸钾和氯化苄经缩合合成肉桂酸苄酯的新方法 ,并对多种离子液体的作用性能进行了考察 .研究结果表明 ,离子液体中BMImBF4的催化性能最佳 ,但是肉桂酸苄酯的收率仍不高 ,只有当相转移催化剂四丁基氯化铵存在时 ,肉桂酸钾与溶于离子液体中的氯化苄在温和的反应条件下才可高效率地得到肉桂酸苄酯 ,收率可达 96 5 % .产物分离简单 ,离子液体和相转移催化剂形成的双催化体系可以稳定地循环使用

Room temperature ionic liquids were used as an environmentally benign solvent to synthesize benzyl cinnamate from potassium cinnamate and benzyl chloride in the presence of tetrabutylammonium chloride (TBAC). BMImBF 4 has the best catalytic capability among the various kinds of ionic liquids investigated and the reaction was found to proceed well under relatively mild conditions by the double catalytic system of ionic liquid/TBAC. The yield is up to 96.5%. The product could be conveniently separated, and the remaining ionic liquid/TBAC catalytic system could be reused for at least five times without much lose in activities.