Supported and liquid phase task specific ionic liquids for base catalysed Knoevenagel reactions
- 作者：C. Paun ; J. Barklie ; P. Goodrich ; H.Q.N. Gunaratne ; A. McKeown ; V.I. Pâ ; rvulescu ; C. Hardacre
- 关键词：Supported ; Task specific ; Ionic liquids ; Basic ; Knoevenagel
- 刊名：Journal of Molecular Catalysis A ; Chemical
- 出版年：2007
- 期刊代码：57_13811169
- 类别：ch
- 出版时间：18 May 2007
- 卷：269
- 期：1-2
- 页码：64-71
- 文件大小：285 K
摘要
A series of Hünig's base tethered ammonium ionic liquids have been used to catalyse the Knoevenagel condensation of aldehydes/ketones with malononitrile and ethyl cyanoacetate. The reactions were performed under homogeneous and under biphasic, liquid–liquid and liquid–silica supported ionic liquid, conditions with the biphasic systems employing cyclohexene as the second phase. By increasing the distance between the ammonium head group and Hünig's base the activity of the catalyst was found to increase. Higher activity, in general, was found under homogeneous reaction conditions; however, the recyclability of the catalyst was improved by supporting the BIL under biphasic conditions.