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Effect of anion type of imidazolium based polymer supported ionic liquids on the solvent free synthesis of cycloaddition of CO2 into epoxide

Paper ID Volume ID Publish Year Pages File Format Full-Text
53786 46984 2016 12 PDF Available
Title
Effect of anion type of imidazolium based polymer supported ionic liquids on the solvent free synthesis of cycloaddition of CO2 into epoxide
Abstract

•Tailored-made imidazolium based polymer supported ILs (PSILs) were synthesized.•PSILs were used as catalyst for coupling reaction of CO2 into epoxide.•Specially designed ILs produced least interactions between the cations and anions.•Effect of type of various anions with imidazolium cations was studied.•100% conversion and 91% yield was obtained at 100 °C using 8 bar CO2 pressure.

Catalytic CO2 fixation into value added products have attracted ample devotion due to the rapid increasing greenhouse gas effect. Especially, by using heterogeneous catalysts, particularly, the designer nature of organic functionality immobilized on polymer supports has driven significant attention. In this work, various tailor made imidazolium based ionic liquids (ILs) covalently immobilized on polymeric support were synthesized successfully (denoted as PSIL) and applied in the cycloaddition of CO2 into epoxides. Imidazolium (C3H5N2+) and various counter anions such as Cl−, Br−, BF4−, PF6−, and NTf2−, were selected to construct less coordinated cations with anions in PSILs. In the fixation of CO2 into epoxide, all the prepared PSILs showed efficient catalytic activity, among them 0.1 equiv. of PSIL-NTf2− composed of imidazolium cations and NTf2− anions was the most efficient, showing 100% conversion and 91% yield of the respective cyclic carbonate under 100 °C reaction temperature using 8 bar pressure in 8 h reaction time. This might be due to the least co-ordinated NTf2− anions with imidazolium cations played a vital role in the ring-opening of epoxide, enhancing the reaction rate and favourable for the worthy yield. In addition, the effects of various reaction parameters including amount of catalyst, temperature, and pressure were studied and numbers of substituted cyclic carbonates were prepared. It was found that PSILs were easily separated from the reaction mixture and reused several times without any significant loss of catalytic activity. The present solvent free catalytic system was found mild, kinetically fast, and naturally benign for the coupling of CO2 into epoxide.

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Keywords
Fixation of CO2; Solvent free reaction; Cyclic carbonate; Ionic liquids
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Effect of anion type of imidazolium based polymer supported ionic liquids on the solvent free synthesis of cycloaddition of CO2 into epoxide
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 265, 1 May 2016, Pages 56–67
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us