期刊
CATALYSIS COMMUNICATIONS
卷 9, 期 7, 页码 1571-1574出版社
ELSEVIER
DOI: 10.1016/j.catcom.2008.01.002
关键词
task-specific ionic liquid; knoevenagel condensation; alpha,beta-unsaturated carbonyl compounds
A task-specific ionic liquid, [H3N+-CH2-CH2-OH][CH3COO-] was synthesized and used as catalyst in the Knoevenagel condensation reaction of various kinds of aromatic aldehydes with ethyl cyanoacetate or malononitrile. alpha,beta-Unsaturated carbonyl compounds were obtained in reasonable yields when the [H3N+-CH2-CH2-OH][CH3COO-] catalyzed Knoevenagel reaction was carried out at room temperature for several to 60 min under solvent-free conditions. Only E-isomers were detected. The task-specific ionic liquid after removed water could be recycled and reused for five times without noticeably decreasing the catalytic activity. The mechanism of the [H3N+-CH2-CH2-OH][CH3COO-] catalyzed Knoevenagel reaction was discussed. (C) 2008 Elsevier B.V. All rights reserved.
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