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Issue 4, 2010
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Effects of acidity and immiscibility of lactam-based Brønsted-acidic ionic liquids on their catalytic performance for esterification†

Hancheng Zhou,a   Jing Yang,a   Linmin Ye,a   Haiqiang Lina  and  Youzhu Yuan*a  
Author affiliations

* Corresponding authors

a State Key Laboratory of Physical Chemistry of Solid Surfaces, National Engineering Laboratory for Green Chemical Productions of Alcohols-Ethers-Esters, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, P. R. China
E-mail: yzyuan@xmu.edu.cn
Fax: +86 592-2183047
Tel: +86 592-2181659

Abstract

Several lactam-based Brønsted-acidic ionic liquids with different acidities were synthesized and applied to the esterification of carboxylic acids with alcohols. High conversion and perfect selectivity were obtained under mild conditions. Among the ionic liquids investigated, those having a methyl sulfonate anion (which has weaker acidity than those with a tetrafluoroborate anion) afforded the highest activity for esterification. The results indicated that the acidity and immiscibility of Brønsted-acidic ionic liquids has a synergistic effect on their esterification performance. Furthermore, after removal of water under vacuum, such ionic liquids could be reused several times without substantial loss of activity.

Graphical abstract: Effects of acidity and immiscibility of lactam-based Brønsted-acidic ionic liquids on their catalytic performance for esterification

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Article information

https://doi.org/10.1039/B921081D
Submitted
12 Oct 2009
Accepted
20 Jan 2010
First published
19 Feb 2010
Green Chem., 2010,12, 661-665
Article type
Paper
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Effects of acidity and immiscibility of lactam-based Brønsted-acidic ionic liquids on their catalytic performance for esterification

H. Zhou, J. Yang, L. Ye, H. Lin and Y. Yuan, Green Chem., 2010, 12, 661
DOI: 10.1039/B921081D

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