Knoevenagel condensation reaction of aromatic aldehydes with some active methylene compounds proceeded efficiently without solvent using ionic liquids as catalyst. The experimental results show that these ionic liquids have good catalytic activities to the Knoevenagel condensation with a wide range of reactant. The reactions are carried out in a few minutes with high yields. The ionic liquids can be recycled and reused for 4 times without noticeably decreasing the catalytic activity.
芳香醛与一些活性亚甲基化合物的Knoevenagel缩合反应在无溶剂条件下利用
离子液体作为催化剂高效进行。实验结果表明,这些
离子液体对Knoevenagel缩合反应具有良好的催化活性,适用范围广。反应在几分钟内完成,产率较高。
离子液体可以回收再利用4次,催化活性没有明显降低。