Imidazolium ionic liquid-supported sulfonic acids: efficient and recyclable catalysts for esterification of benzoic acid |
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| Authors: | Yue Qin Cai Guo Qiang Yu Chuan Duo Liu Yuan Yuan Xu Wei Wang |
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| Institution: | a School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China;b School of Chemistry and Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China;c Shanghai Key Laboratory of Chemical Biology, Institute of Pesticides & Pharmaceuticals, East China University of Science and Technology, Shanghai 200237, China |
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| Abstract: | Several imidazolium ionic liquid (IL)-supported sulfonic acids with different anions, C3SO3Hmim]HSO4, C3SO3Hmim]BF4, C3SO3Hmim]PF6, and C3SO3Hmim]CF3SO3, 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 HSO4− shows the best catalytic activity. Only when less C3SO3Hmim]HSO4 (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. |
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| Keywords: | IL-supported sulfonic acid Catalyst Esterification reaction Benzoic acid |
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