Guoying Zhao, T. Jiang, Hai-jun Gao
Jan 30, 2004
Citations
1
Influential Citations
261
Citations
Quality indicators
Journal
Green Chemistry
Abstract
Several Bronsted acidic ionic liquids were synthesized and successfully used as solvents and catalysts of three-component Mannich reactions of aldehdyes, amines, and ketones at 25 °C. The used Bronsted acidic ionic liquids include l-butyl-3-methylimidazolium hydrogen sulfate ([Bmim]+[HSO4]−), l-butyl-3-methylimidazolium dihydrogen phosphate ([Bmim]+[H2PO4]−), 1-methylimidazolium p-toluenesulfonic acid ([Hmim]+Tsa−) and 1-methylimidazolium trifluoroacetic acid ([Hmim]+Tfa−). Higher yields were obtained in the presence of [Hmim]+Tfa− in comparison with other Bronsted acidic ionic liquids. The [Hmim]+Tfa− was reused four times without considerable loss of activity.