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Issue 3, 2012
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Chitosan functionalized ionic liquid as a recyclable biopolymer-supported catalyst for cycloaddition of CO2

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Abstract

Development of efficient, cheap and recyclable catalysts for a reaction under green reaction conditions is still a very attractive topic. In this work, the cycloaddition reactions of CO2 with various epoxides to form five-membered cyclic carbonates catalyzed by chitosan functionalized 1-ethyl-3-methyl imidazolium halides (CS-EMImX, X = Cl, Br) without additional solvent and metal co-catalyst were achieved in high yield and selectivity. The catalyst could be easily recovered and reused five times with high catalytic activity and selectivity. Besides, a possible catalytic cycle for the hydrogen bond assisted ring-opening of epoxide and activation of CO2 induced by the nucleophilic tertiary nitrogen of the chitosan was also proposed. The process represents a simple, ecologically safe and cost-effective route to synthesize cyclic carbonates with high product yield, as well as easy catalyst recycling.

Graphical abstract: Chitosan functionalized ionic liquid as a recyclable biopolymer-supported catalyst for cycloaddition of CO2

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Supplementary files

Article information


Submitted
26 Oct 2011
Accepted
24 Nov 2011
First published
06 Jan 2012

Green Chem., 2012,14, 654-660
Article type
Paper

Chitosan functionalized ionic liquid as a recyclable biopolymer-supported catalyst for cycloaddition of CO2

J. Sun, J. Wang, W. Cheng, J. Zhang, X. Li, S. Zhang and Y. She, Green Chem., 2012, 14, 654
DOI: 10.1039/C2GC16335G

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