Highly efficient CO2 fixation into cyclic carbonate by hydroxyl-functionalized protic ionic liquids at atmospheric pressure

We report an efficient strategy for CO2 fixation into cyclic carbonates catalyzed by hydroxyl-functionalized protic ionic liquids (PILs) without any solvent and additive. Excellent yields of cyclic carbonates are obtained for the varied substrates under mild conditions (1 bar and 60 degrees C). Mechanism studies have shown that hydroxyl pro-moted the activation of epoxide molecules through hydrogen bonding interaction, so that CO2 can be easily converted into the desired product of cyclic carbonates. In addition, the hydroxyl-functionalized PILs can also be recycled repeatedly. This hydroxyl-functionalized PILs-catalyzed process is proved to be a promising scheme for the chemical conversion of CO2.

Automated summary

An efficient strategy for the conversion of CO2 into cyclic carbonates catalyzed by hydroxyl-functionalized protic ionic liquids (PILs) has been successfully developed, achieving high conversion rates without the need for solvents or additives under mild conditions. Mechanistic studies demonstrate that hydroxyl groups promote the activation of epoxide molecules, facilitating the conversion of CO2 into cyclic carbonates. The hydroxyl-functionalized PILs can be recycled, making this process a promising scheme for chemical CO2 conversion.