title: Highly efficient nitrogen chelated ruthenium carbene metathesis catalysts.
abstract: A series of nitrogen chelated ruthenium carbene metathesis catalysts containing an N-heterocyclic carbene (NHC) and a carbonyl group have been developed and their catalytic activities for olefin metathesis reactions were investigated. The X-ray structure of the [(H2IMes)(Cl)2Ru]C(H)CH2[p-F(C6H3)NC(CF3)(C(O)OCH2CH3)] complex shows that the carbonyl oxygen of the ester and the imine nitrogen are both coordinated to the Ru metal to give an octahedral structure. The catalytic activity of these ruthenium carbene complexes for olefin metathesis reactions was tested. Some of the complexes bearing electron withdrawing groups had high initiation rates. These complexes exhibited excellent performance for both ring-closing metathesis and cross metathesis.
authors.affiliation: Department of Chemistry, College of Science, Tianjin University, Tianjin 300350, P. R. China. wjh@tju.edu.cn and Collaborative Innovation Center of Chemical Science and Engineering, Tianjin, 300072, P. R. China.
authors.forename: Yulian
authors.initials: Y
authors.lastname: Duan
authors.affiliation: Department of Chemistry, College of Science, Tianjin University, Tianjin 300350, P. R. China. wjh@tju.edu.cn and Collaborative Innovation Center of Chemical Science and Engineering, Tianjin, 300072, P. R. China.
authors.forename: Tao
authors.initials: T
authors.lastname: Wang
authors.affiliation: Department of Chemistry, College of Science, Tianjin University, Tianjin 300350, P. R. China. wjh@tju.edu.cn and Collaborative Innovation Center of Chemical Science and Engineering, Tianjin, 300072, P. R. China.
authors.forename: Qingxiao
authors.initials: Q
authors.lastname: Xie
authors.affiliation: Department of Chemistry, College of Science, Tianjin University, Tianjin 300350, P. R. China. wjh@tju.edu.cn and Collaborative Innovation Center of Chemical Science and Engineering, Tianjin, 300072, P. R. China and College of Materials Science and Engineering, Jilin Institute of Chemical Technology, Jilin 132022, P. R. China.
authors.forename: Xiaobo
authors.initials: X
authors.lastname: Yu
authors.affiliation: Department of Chemistry, College of Science, Tianjin University, Tianjin 300350, P. R. China. wjh@tju.edu.cn and Collaborative Innovation Center of Chemical Science and Engineering, Tianjin, 300072, P. R. China.
authors.forename: Weijie
authors.initials: W
authors.lastname: Guo
authors.affiliation: Department of Chemistry, College of Science, Tianjin University, Tianjin 300350, P. R. China. wjh@tju.edu.cn and Collaborative Innovation Center of Chemical Science and Engineering, Tianjin, 300072, P. R. China.
authors.forename: Jianhui
authors.initials: J
authors.lastname: Wang
authors.affiliation: Tianjin Key Laboratory of Structure and Performance for Functional Molecules, Key Laboratory of Inorganic-Organic Hybrid Functional Material Chemistry (Tianjin Normal University), Ministry of Education, College of Chemistry, Tianjin Normal University, Tianjin 300387, P. R. China. guiyanliu2013@163.com.
authors.forename: Guiyan
authors.initials: G
authors.lastname: Liu