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Synthesis of cyclic carbonates from carbon dioxide and epoxides over betaine-based catalysts

✍ Scribed by Yinxi Zhou; Suqin Hu; Xiumin Ma; Shuguang Liang; Tao Jiang; Buxing Han

Publisher: Elsevier Science
Year: 2008
Tongue: English
Weight: 438 KB
Volume: 284
Category: Article
ISSN: 1381-1169
DOI: 10.1016/j.molcata.2008.01.010

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✦ Synopsis

A series of betaine-based salts containing quaternary ammonium ion and carboxylic acid group were synthesized by direct protonation of anhydrous betaine using different Brønsted acids. The catalytic activity of these salts for the synthesis of cyclic carbonates via cycloaddition reaction of CO 2 with epoxides was studied. The effects of anions of the salts, reaction temperature, pressure, reaction time, and the amount of catalyst used on the reaction were studied. It was demonstrated that the carboxylic acid group in the catalyst had synergetic effect with halide anion, and high yield of cyclic carbonates and excellent selectivity could be achieved at optimized condition.

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