An Efficient and Recyclable Imidazolium Salts-Functionalized Mesoporous Catalyst for Microwave-Promoted Knoevenagel Condensations in Solid Medium
A convenient method for the preparation of imidazolium salts-functionalized mesoporous catalyst Me-Bmim-SBA-15 (2) by postgrafting [bmIm]OH on SBA-15 was developed. This catalyst presented excellent catalytic activities (more than 96% yields for all tested aldehydes) for Knoevenagel condensation of aldehydes and ethyl cyanoacetate under microwave irradiation in solid medium. Of particular note is that such a catalyst could be readily recovered and reused in the consecutively catalytic runs (up to 10 uses) while maintained high catalytic activity.
Weiguo Pan, Jianxing Ren and Yongguang Li
Y. L. Xu et al., "An Efficient and Recyclable Imidazolium Salts-Functionalized Mesoporous Catalyst for Microwave-Promoted Knoevenagel Condensations in Solid Medium", Advanced Materials Research, Vols. 347-353, pp. 1944-1948, 2012