Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 7, Issue 19, Pages 16674-16681Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.9b04090
Keywords
CO2 conversion; Homogeneous catalysis; Deep eutectic ionic liquid; Cycloaddition; Cyclic carbonate
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Funding
- National Natural Science Foundation of China [21805154, 51673106]
- Natural Science Foundation of Shandong Province [ZR2018BB009]
- Project of Shandong Province Higher Educational Science and Technology Program [J18KA065]
- China Postdoctoral Science Foundation [2019M652343]
- Opening Project of Shandong Eco-chemical Engineering Collaborative Innovation Center [XTCXQN01]
- Scientific Research Foundation of Qingdao University of Science and Technology [0100229019]
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Novel phosphonium-based deep eutectic ionic liquids were well designed and facilely synthesized; their structures and physical properties were studied in detail. As single-component and sustainable media they were successfully used for efficient cycloaddition of CO2 to epoxides under mild conditions. The effects of ionic liquid structures, reaction parameters, and substrate scope on the cycloaddition reaction were examined thoroughly. Among the designed ionic liquids, the tetra-n-butylphosphonium bromide (TBPB) combined with 3-aminophenol (3-AP) in a molar ratio of 1:2 was proved to be the most active catalyst, which could afford good to excellent cyclic carbonate yields with satisfactory selectivities under the optimum conditions (80 degrees C, 1 MPa, 1 h). Moreover, the TBPB/3-AP was easily recovered and showed excellent reusability. The TBPB/3-AP medium realized the simultaneous activation of CO2 and epoxide; finally, the cooperative activation and reaction pathways were proposed.
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