期刊
MOLECULAR CATALYSIS
卷 538, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.mcat.2023.112988
关键词
CO2; Carbonates; pyridinium ionic liquid
Ionic liquids are efficient catalysts with non-toxic, biodegradable, non-volatile, and low-cost properties for the synthesis of cyclic organic carbonates. The synthetic catalyst exhibited high conversion and selectivity under mild conditions without the need for co-catalyst, metal, or solvent. It could also be recycled multiple times before losing its catalytic activity.
Ionic liquids (ILs) are used as non-toxic, biodegradable, non-volatile, and relatively low-cost catalysts to syn-thesize 5-membered cyclic organic carbonates (COCs) from carbon dioxide (CO2) and different types of oxiranes in great conversion and selectivity. Single-component IL containing pyridinium salt moieties as quaternary amine, the carboxylic functional group as a H-bond donor, and bromine as a nucleophile and significant leaving group was synthesized by a simple method. The simultaneous selection and use of all mentioned factors in IL caused the epoxides converted into their corresponding carbonates under mild conditions, under 1 atm carbon dioxide (CO2) pressure (CO2 balloon), co-catalyst/ metal/ and solvent-free during 2.5 h. The synthetic catalyst converted styrene oxide (SO) to styrene carbonate (SC) with 100% conversion and selectivity. Moreover, the catalyst could be recycled more than four times before losing its remarkable catalytic activity. Finally, an inferential mechanism was suggested according to the experimental results.
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