Abstract
• Highly efficient CO 2 fixation into cyclic carbonate by hydroxyl-functionalized protic ionic liquids. • Excellent yields of cyclic carbonates are obtained for the varied substrates under mild conditions. • Activation of epoxide molecules through hydrogen bonding interaction. We report an efficient strategy for CO 2 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°C). Mechanism studies have shown that hydroxyl promoted the activation of epoxide molecules through hydrogen bonding interaction, so that CO 2 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 CO 2 .
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