title: Polyoxometalate-based homochiral metal-organic frameworks for tandem asymmetric transformation of cyclic carbonates from olefins.
abstract: Currently, great interest is focused on developing auto-tandem catalytic reactions; a substrate is catalytically transferred through mechanistically distinct reactions without altering any reaction conditions. Here by incorporating a pyrrolidine moiety as a chiral organocatalyst and a polyoxometalate as an oxidation catalyst, a powerful approach is devised to achieve a tandem catalyst for the efficient conversion of CO2 into value-added enantiomerically pure cyclic carbonates. The multi-catalytic sites are orderly distributed and spatially matched in the framework. The captured CO2 molecules are synergistically fixed and activated by well-positioned pyrrolidine and amine groups, providing further compatibility with the terminal W=O activated epoxidation intermediate and driving the tandem catalytic process in a single workup stage and an asymmetric fashion. The structural simplicity of the building blocks and the use of inexpensive and readily available chemical reagents render this approach highly promising for the development of practical homochiral materials for CO2 conversion.
authors.affiliation: State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, China.|Key Laboratory of Polyoxometalate Chemistry of Henan Province, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China.
authors.forename: Qiuxia
authors.initials: Q
authors.lastname: Han
authors.affiliation: State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, China.
authors.forename: Bo
authors.initials: B
authors.lastname: Qi
authors.affiliation: State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, China.
authors.forename: Weimin
authors.initials: W
authors.lastname: Ren
authors.affiliation: State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, China.
authors.forename: Cheng
authors.initials: C
authors.lastname: He
authors.affiliation: Key Laboratory of Polyoxometalate Chemistry of Henan Province, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China.
authors.forename: Jingyang
authors.initials: J
authors.lastname: Niu
authors.affiliation: State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, China.|Collaborative Innovation Center of Chemical Science and Engineering, Tianjin 300071, China.
authors.forename: Chunying
authors.initials: C
authors.lastname: Duan