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A green catalysis of CO2 fixation to aliphatic cyclic carbonates by a new ionic liquid system

Paper ID Volume ID Publish Year Pages File Format Full-Text
39800 45836 2014 7 PDF Available
Title
A green catalysis of CO2 fixation to aliphatic cyclic carbonates by a new ionic liquid system
Abstract

•An environmentally benign ionic liquid system for carbon dioxide fixation.•Addition of carbon dioxide to non-polar aliphatic epoxides under mild reaction conditions.•Relatively mild CO2 pressure and low temperature.•Convenient recycling and reuse of the medium.

A mixed ionic liquid system has been developed for the efficient catalysis of CO2 addition to aliphatic epoxides without involving any transition metal catalysts or other additives. The ionic liquid integrated with pyridinium and pyrrolidinium groups (1·(Br)3) together with a non-polar ionic liquid (3·(Ntf)2) effectively transformed non-polar aliphatic epoxides to cyclic carbonates by the reaction with CO2 under mild CO2 pressure (3.0 MPa) and reaction temperature (80 °C). The presence of 3·(Ntf)2 remarkably improved the catalytic activity of 1·(Br)3 towards non-polar epoxides by increasing the miscibility of catalyst with the substrates. The mixed ionic liquid system is robust enough to be recycled without any significant loss of catalytic activity. GC–MS studies were performed to reveal the reaction pathways to the cyclic carbonates and a feasible model accounting for the effective CO2 activation in the ionic liquid system was proposed using density functional theory (DFT) calculations.

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Keywords
Ionic liquid; Organocatalysis; CO2 fixation; Cyclic carbonate; Green chemistry
First Page Preview
A green catalysis of CO2 fixation to aliphatic cyclic carbonates by a new ionic liquid system
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 472, 22 February 2014, Pages 160–166
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis