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Efficient conversion of CO2 into cyclic carbonates at room temperature catalyzed by Al-salen and imidazolium hydrogen carbonate ionic liquids

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Abstract

A novel process for the efficient synthesis of cyclic carbonates from CO2 and epoxides at room temperature in the absence of a solvent has been achieved by using Al-salen complexes as catalysts and imidazolium hydrogen carbonate ionic liquids ([CnCmIm][HCO3]) as cocatalysts. As a halide ion-free cocatalyst, [CnCmIm][HCO3] showed higher catalytic reactivity compared to traditional halogen-containing quaternary ammonium salts (such as (nBu)4NBr) and organic bases. The catalytic system can be used for the cycloaddition of a series of substrates with good to excellent yields at room temperature in the absence of a solvent. Besides, the catalytic system can be easily recycled at least four times without significant loss of catalytic activity. A possible mechanism was proposed, in which Al-salen and carbene activate the epoxides and CO2 respectively.

Graphical abstract: Efficient conversion of CO2 into cyclic carbonates at room temperature catalyzed by Al-salen and imidazolium hydrogen carbonate ionic liquids

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Article information


Submitted
06 Feb 2020
Accepted
07 Jun 2020
First published
08 Jun 2020

Green Chem., 2020, Advance Article
Article type
Paper

Efficient conversion of CO2 into cyclic carbonates at room temperature catalyzed by Al-salen and imidazolium hydrogen carbonate ionic liquids

J. Liu, G. Yang, Y. Liu, D. Zhang, X. Hu and Z. Zhang, Green Chem., 2020, Advance Article , DOI: 10.1039/D0GC00458H

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