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Indexed by:期刊论文

Date of Publication:2021-01-10

Journal:GREEN CHEMISTRY

Volume:22

Issue:22

Page Number:7832-7838

ISSN No.:1463-9262

Abstract:Herein, we present a highly efficient and convenient approach for carbon dioxide (CO2) capture and catalytic transformation under mild conditions using N,N '-bis(imidazolyl)guanidines (BIGs, organoguanidine-based strong superbases) as the organocatalyst, even from simulated flue gas (10% CO2/90% N-2, v/v) or directly from dry air (similar to 400 ppm CO2). The zwitterionic BIG-CO2 adducts were successfully isolated and characterized. X-ray single crystal analysis revealed the bent geometry of the binding CO2 in the BIG-CO2 adduct with an O-C-O angle of 129.7 degrees and increased C-O bond distances (1.253 and 1.237 angstrom) in comparison with free CO2. Notably, the resulting BIG-CO2 adducts were found to be capable of catalyzing the novel cycloaddition of various propiolamidines with simulated flue gas to generate functionalized (4E,5Z)-4-imino-5-benzylideneoxazolidine-2-ones in good yields and excellent selectivity.