Imidazolium ionic liquid-supported sulfonic acids:Efficient and recyclable catalysts for esterification of benzoic acid  

作　　者：Yue Qin Cai Guo Qiang Yu Chuan Duo Liu Yuan Yuan Xu Wei Wang 

机构地区：[1]School of Chemistry and Molecular Engineering,East China University of Science and Technology,Shanghai 200237,China [2]School of Chemistry and Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China [3]Shanghai Key Laboratory of Chemical Biology,Institute of Pesticides&Pharmaceuticals,East China University of Science and Technology,Shanghai 200237,China

出　　处：《Chinese Chemical Letters》2012年第1期1-4,共4页中国化学快报（英文版）

基　　金：the National Natural Science Foundation of China(No.20676033);China Postdoctoral Science Foundation(No.20070410169);Shanghai Leading Academic Discipline Project(No.B507) for financial support

摘　　要：Several imidazolium ionic liquid（IL）-supported sulfonic acids with different anions,[C_3SO_3Hmim]HSO_4,[C_3SO_3Hmim]BF_4, [C_3SO_3 Hmim]PF_6,and[C_3SO_3Hmim]CF_3SO_3,were synthesized and applied as catalysts for esterification reaction of benzoic acid. The experimental results indicate that imidazolium IL-supported sulfonic acid containing anion of HSO_4^- shows the best catalytic activity.Only when less[C_3SO_3Hmim]HSO_4（0.3 equiv.） applied,was the product obtained with high yield of 97%.Furthermore, the produced esters could be separated by decantation,and the catalyst could be reused after the removal of water.Several imidazolium ionic liquid（IL）-supported sulfonic acids with different anions,[C_3SO_3Hmim]HSO_4,[C_3SO_3Hmim]BF_4, [C_3SO_3 Hmim]PF_6,and[C_3SO_3Hmim]CF_3SO_3,were synthesized and applied as catalysts for esterification reaction of benzoic acid. The experimental results indicate that imidazolium IL-supported sulfonic acid containing anion of HSO_4^- shows the best catalytic activity.Only when less[C_3SO_3Hmim]HSO_4（0.3 equiv.） applied,was the product obtained with high yield of 97%.Furthermore, the produced esters could be separated by decantation,and the catalyst could be reused after the removal of water.

关 键 词：IL-supported sulfonic acid Catalyst Esterification reaction Benzoic acid 

分 类 号：O623.624[理学—有机化学] O646.1[理学—化学]