Abstract
Task‐specific ionic liquids possessing two Brönsted acid sites with –COOH, HSO− 4, or H2PO− 4 groups have been designed, synthesized, and characterized. Under mild conditions and without any additional organic solvent, the esterification of isopropanol by chloroacetic acid could be carried out in these new task‐specific ionic liquids. In comparison with most of acidic ionic liquids in current use, these ionic liquids are halogen free and more environmentally benign as media and catalysts.
Acknowledgment
We are grateful for the financial support from the National Natural Science Foundation of China (No. 20476042) and the Educational Department of Liaoning Province (No. 05L234).