Journal
GREEN CHEMISTRY
Volume 12, Issue 4, Pages 661-665Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b921081d
Keywords
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Funding
- NSFC [20873108]
- 973 program [2009CB939804]
- Key Scientific Project of Fujian Province [2009HZ0002-1]
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Several lactam-based Bronsted-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 Bronsted-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.
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