title: Recyclable Single-Component Rare-Earth Metal Catalysts for Cycloaddition of CO2and Epoxides at Atmospheric Pressure.
abstract: Ionic rare-earth metal complexes 1-4 bearing an imidazolium cation were synthesized, which, as single-component catalysts, showed good activity in catalyzing cyclic carbonate synthesis from epoxides and CO2. In the presence of 0.2 mol % catalyst, monosubstituted epoxides bearing different functional groups were converted into cyclic carbonates in 60-97% yields under atmospheric pressure. In addition, bulky/internal epoxides with low reactivity yielded cyclic carbonates in 40-95% yields. More importantly, the readily available samarium complex 2 was reused for six successive cycles without any significant loss in its catalytic activity. This is the first recyclable rare-earth metal-based catalyst in cyclic carbonate synthesis.
authors.affiliation: Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Dushu Lake Campus, Soochow University , Suzhou 215123, P. R. China.
authors.forename: Zhiwen
authors.initials: Z
authors.lastname: Zhao
authors.affiliation: Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Dushu Lake Campus, Soochow University , Suzhou 215123, P. R. China.
authors.forename: Jie
authors.initials: J
authors.lastname: Qin
authors.affiliation: Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Dushu Lake Campus, Soochow University , Suzhou 215123, P. R. China.
authors.forename: Chen
authors.initials: C
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Dushu Lake Campus, Soochow University , Suzhou 215123, P. R. China.
authors.forename: Yaorong
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Dushu Lake Campus, Soochow University , Suzhou 215123, P. R. China.
authors.forename: Dan
authors.initials: D
authors.lastname: Yuan
authors.affiliation: Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Dushu Lake Campus, Soochow University , Suzhou 215123, P. R. China.
authors.forename: Yingming
authors.identifier: http://orcid.org/0000-0001-9841-3169
authors.initials: Y
authors.lastname: Yao