fulltext.study @t Gmail

Facile synthesis of cyclic carbonates from CO2 and epoxides with cobalt(II)/onium salt based catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
42564 45931 2009 5 PDF Available
Title
Facile synthesis of cyclic carbonates from CO2 and epoxides with cobalt(II)/onium salt based catalysts
Abstract

Efficient catalytic systems based on the combination of cobalt(II)/onium salts for the coupling reaction of CO2 and epoxides are reported. The catalytic systems work under mild reaction conditions (e.g. 10 bar and 120 °C) and produce cyclic carbonates with high turnover frequencies (TOF) and selectivity. From a series of onium salts, bis(triphenylphosphoranylidene)ammonium chloride proved to be the most active cocatalyst (TOF = 2314), while tetrabutyl ammonium chloride (TOF = 2223) and 1,3-bis(2,4,6trimethylphenyl)imidazolium chloride (TOF = 2174) provided only slightly reduced activities under similar conditions. The influence of various reaction parameters including CO2 pressure, reaction temperature and loading of onium salt was determined. In order to obtain an insight into the catalytic process, the reaction was followed by electrospray ionisation-mass spectrometry. Additionally, in situ FT-IR measurements show that the catalyst is stable even with low loading (0.025 mol%) and as a result, the reaction proceeds steadily over several hours.

Graphical abstractEfficient catalytic systems based on the combination of cobalt(II)/onium salts for the coupling reaction of CO2 and epoxides is reported. The influences of various reaction parameters including CO2 pressure, reaction temperature and amount of onium salts were further investigated. A reaction mechanism of CoCl2/TBACl is proposed based on the observed catalytic species via ESI-MS measurement.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
CO2; Epoxide; Cyclic carbonate; Onium salt; CoCl2
First Page Preview
Facile synthesis of cyclic carbonates from CO2 and epoxides with cobalt(II)/onium salt based catalysts
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
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 365, Issue 2, 31 August 2009, Pages 194–198
Authors
, , , , ,
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