Abstract
Lewis-Brönsted combined basic ionic liquids were successfully synthesized. Their catalytic activity for the condensation of aldehydes/ketones with ethyl cyanoacetate was also investigated. The results showed that these combined basic ionic liquids possess very high activity for Knoevenagel condensation. Different aromatic aldehydes reacted with cyanoacetate to give the corresponding products in 85% - 99% yields. It was found that protonated solvents had higher activity than other solvents. This solvent effect was probably caused by the activation of carbonyl through hydrogen bond. The combined basic ionic liquids could be reused for 3 times without decrease of activity.
| Original language | English |
|---|---|
| Pages (from-to) | 626-630 |
| Number of pages | 5 |
| Journal | Chemistry Bulletin / Huaxue Tongbao |
| Volume | 71 |
| Issue number | 8 |
| State | Published - 2008 |
Keywords
- Knoevenagel condensation
- Lewis-Brönsted combined basic ionic liquid
- Solvent effect
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