期刊
ULTRASONICS SONOCHEMISTRY
卷 17, 期 5, 页码 752-755出版社
ELSEVIER
DOI: 10.1016/j.ultsonch.2010.02.004
关键词
Bronsted acid; Ionic liquid; Fischer esterification; Lactic acid esters
资金
- Research Starting Foundation of Minjiang University [YKQ0805]
- Fujian Province Education Department [JA09189]
- Natural Science Foundation of Fujian Province [J0164]
Mild and efficient Fischer esterification reactions of lactic acid with a variety of straight chain aliphatic alcohols, cyclohexanol and benzyl alcohol were successfully performed using two novel Bronsted acidic ionic liquids that bear an aromatic sulfonic acid group on the imidazolium or pyridinium cation under ultrasound irradiation. These reactions carried out smoothly with good to excellent conversion rate (78-96%) and satisfactory yields (73-92%) in shorter reaction time (4-6 h) at room temperature when the amount of ionic liquids was 20 mol%. These ionic liquids could be recovered readily and recycled five times without any significant loss in their catalytic activity. (C) 2010 Elsevier B.V. All rights reserved.
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