文献类型：期刊文献

英文题名：Imidazolium Polyoxometalate: An Ionic Liquid Catalyst for Esterification and Oxidative Esterification

作者：Li, Huan[1];Qiao, Yunxiang[1];Hua, Li[1];Hou, Zhenshan[1];Feng, Bo[1];Pan, Zhenyan[1];Hu, Yu[1];Wang, Xiangrui[1];Zhao, Xiuge[1];Yu, Yinyin[1]

机构：[1]E China Univ Sci & Technol, Key Lab Adv Mat, Res Inst Ind Catalysis, Shanghai 200237, Peoples R China

年份：2010

卷号：2

期号：9

起止页码：1165

外文期刊名：CHEMCATCHEM

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000283039100017)】；

基金：The authors are grateful for support from the National Natural Science Foundation of China (No. 20773037), ECUST (No. YJ0142136), and the Commission of Science and Technology of Shanghai Municipality (No. 07J14023), China. The authors would also like to express their thanks for Prof. Walter Leitner's helpful suggestions and Dr. Nils Theyssen's experimental assistance.

语种：英文

外文关键词：emulsion; esterification; ionic liquids; oxidation; polyoxometalates

摘要：A new family of polyoxometalate-based ionic liquids (POM-IL) is synthesized, characterized, and employed as catalysts in the esterification of various alcohols with acetic acid. The ionic liquid catalyst shows high activity and gives excellent yields of esters. An emulsion forms between the IL catalyst and substrates during the reaction and promotes the catalytic process. After reaction, the emulsion can conveniently be broken by the addition of a weakly polar organic solvent to facilitate the separation of the catalyst. On the basis of the above results, a direct transformation of benzaldehyde to methyl ester under relatively mild conditions is also developed in the absence of any cocatalyst. Finally, the scope of the substrates and recyclability of the catalyst are also investigated.