Citation: Yue Qin Cai, Guo Qiang Yu, Chuan Duo Liu, Yuan Yuan Xu, Wei Wang. Imidazolium ionic liquid-supported sulfonic acids:efficient and recyclable catalysts for esterification of benzoic acid[J]. Chinese Chemical Letters, ;2012, 23(1): 1-4. doi: 10.1016/j.cclet.2011.09.016 shu

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

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

Received Date: 10 May 2011

Fund Project: We acknowledge the National Natural Science Foundation of China (No. 20676033), China Postdoctoral Science Foundation (No. 20070410169), and Shanghai Leading Academic Discipline Project (No. B507) for financial support.

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.
- IL-supported sulfonic acid,
- Catalyst,
- Esterification reaction,
- Benzoic acid
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