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Imidazolium Polyoxometalate: An Ionic Liquid Catalyst for Esterification and Oxidative Esterification
Author(s) -
Li Huan,
Qiao Yunxiang,
Hua Li,
Hou Zhenshan,
Feng Bo,
Pan Zhenyan,
Hu Yu,
Wang Xiangrui,
Zhao Xiuge,
Yu Yinyin
Publication year - 2010
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201000021
Subject(s) - polyoxometalate , ionic liquid , catalysis , chemistry , acetic acid , benzaldehyde , solvent , emulsion , organic chemistry , ionic bonding , inorganic chemistry , ion
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.