肉桂酸正丁酯的催化合成研究

Catalytic Synthesis of n-Butyl Cinnamate

应用硫酸氢钾催化肉桂酸与正丁醇的酯化反应,合成了肉桂酸正丁酯。研究结果表明,硫酸氢钾具有较高的催化活性。考察了肉桂酸/正丁醇摩尔比、催化剂用量、反应时间对酯产率的影响,以及催化剂的重复使用性能。在典型反应条件(肉桂酸/正丁醇/硫酸氢钾的摩尔比=1∶15∶0.55,回流3 h)下,肉桂酸正丁酯的产率为95.9%。该催化剂易于回收且可重复使用。同时用折光率、元素分析和红外光谱进行了表征,产品完全合格。

N-butyl cinnamate was synthesized by the esterification of n-butanol with cinnamic acid in the presence of potassium bisulfate monohydrate. The results showed that the potassium bisulfate monohydrate had high catalytic activity for the esterification reaction . The effects of the molar ratio of cinnamic acid to n-butanol, the amount of potassium bisulfate monohydrate, and the reaction time on the yield of n-butanol and catalysis activity of reused catalysts had been studied. Under the optimum conditions, the ester yield could reach 95.9 % （the molar ratio of cinnamic acid/n-butanol /potassium bisulfate = 1 ： 15 ： 0.55, refluxed 3h）. Bisulfate monohydrate catalyst could be easily recovered and reused. The product was characterized by refractive index and elemental analysis and infrared spectroscopy.