点击次数：

论文类型：期刊论文

发表时间：2021-01-10

发表刊物：GREEN CHEMISTRY

卷号：22

期号：22

页面范围：7832-7838

ISSN号：1463-9262

摘要：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.