title: Modular "Click" Preparation of Bifunctional Polymeric Heterometallic Catalysts.
abstract: Heterobimetallic molecular complexes or strictly alternating metallated polymers are obtained by a click reaction between mononuclear metal complexes (secondary building units, SBUs) bearing NHCs functionalized with either p-azidophenyl or p-ethynylphenyl wingtips. With a copper-NHC complex as SBU the formation of molecular or polymeric compounds did not require any additives as the copper complex catalyzes the click reaction. Transmetallation from heterobimetallic Cu/Ag derivatives to Cu/Pd derivatives was achieved. The linker between the SBUs (flexible or rigid) influences the catalytic activity of the heterobimetallic compounds. The polymer with alternating copper-NHC and silver-NHC units and a flexible methylene-triazole bridge between them shows the highest activity in the catalytic alkynylation of trifluoromethyl ketones to give fluorinated propargylic alcohols.
authors.affiliation: State Key Laboratory for Oxo Synthesis and Selective Oxidation, Chinese Academy of Sciences, Lanzhou, 730000 (P.R., China.
authors.forename: Wenlong
authors.initials: W
authors.lastname: Wang
authors.affiliation: State Key Laboratory for Oxo Synthesis and Selective Oxidation, Chinese Academy of Sciences, Lanzhou, 730000 (P.R., China.
authors.forename: Liyuan
authors.initials: L
authors.lastname: Zhao
authors.affiliation: State Key Laboratory for Oxo Synthesis and Selective Oxidation, Chinese Academy of Sciences, Lanzhou, 730000 (P.R., China.
authors.forename: Hui
authors.initials: H
authors.lastname: Lv
authors.affiliation: State Key Laboratory for Oxo Synthesis and Selective Oxidation, Chinese Academy of Sciences, Lanzhou, 730000 (P.R., China.
authors.forename: Guodong
authors.initials: G
authors.lastname: Zhang
authors.affiliation: State Key Laboratory for Oxo Synthesis and Selective Oxidation, Chinese Academy of Sciences, Lanzhou, 730000 (P.R., China.
authors.forename: Chungu
authors.initials: C
authors.lastname: Xia
authors.affiliation: Institut für Anorganische und Analytische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstrasse 30, 48149, Münster, Germany. fehahn@uni-muenster.de.
authors.forename: F Ekkehardt
authors.initials: FE
authors.lastname: Hahn
authors.affiliation: State Key Laboratory for Oxo Synthesis and Selective Oxidation, Chinese Academy of Sciences, Lanzhou, 730000 (P.R., China. fuweili@licp.cas.cn.
authors.forename: Fuwei
authors.initials: F
authors.lastname: Li
keywords: N-heterocyclic carbene; bifunctional catalysts; catalyst design; click chemistry; cooperative catalysis