采用咪唑(啉)-2-羧酸盐(ImCO2)作为催化剂前驱体,通过温度控制脱除ImCO2的2-位羧酸根,再原位释放出高活性的N-杂环卡宾(NHCs),进而催化转酯反应.研究了NHCs在苯甲酸乙酯与一元醇、二元醇及氨基醇反应体系中的催化活性.结果表明,在该体系中不需要选用活化酯为原料,无需加入分子筛或加大醇酯比提高产率,仅用少量催化剂(0.5mol%),在较短时间内(3h),即可使反应转化率达到95%. Using ImCO2 as catalyst precursor, the 2-position carboxylate of ImCO2 was removed by temperature control and the highly active N-heterocyclic carbenes (NHCs) were released in situ Catalyzed transesterification.The catalytic activity of NHCs in the reaction of ethyl benzoate with monohydric alcohols, dihydric alcohols and amino alcohols was studied.The results showed that it is not necessary to use activated esters as raw materials in this system, without adding molecular sieves or adding Large alcohol ester ratio increased yield, only a small amount of catalyst (0.5mol%), in a short period of time (3h), you can make the reaction conversion rate of 95%.