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Unsaturated NHC Complexes Immobilized by the Backbone: Synthesis and Application

Authors

  • Dr. Peng Li,

    1. Chair of Inorganic Chemistry, Technische Universität München, Lichtenbergstrasse 4, 85747 Garching (Germany), Fax: (+49) 89-289-13473
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  • Prof. Dr. Wolfgang A. Herrmann,

    Corresponding author
    1. Chair of Inorganic Chemistry, Technische Universität München, Lichtenbergstrasse 4, 85747 Garching (Germany), Fax: (+49) 89-289-13473
    • Chair of Inorganic Chemistry, Technische Universität München, Lichtenbergstrasse 4, 85747 Garching (Germany), Fax: (+49) 89-289-13473

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  • Prof. Dr. Fritz E. Kühn

    Corresponding author
    1. Chair of Inorganic Chemistry, Technische Universität München, Lichtenbergstrasse 4, 85747 Garching (Germany), Fax: (+49) 89-289-13473
    2. Molecular Catalysis, Catalysis Research Center, Technische Universität München, Ernst-Otto-Fischer Strasse 1, 85747 Garching (Germany), Fax: (+49) 89-289-13473
    • Chair of Inorganic Chemistry, Technische Universität München, Lichtenbergstrasse 4, 85747 Garching (Germany), Fax: (+49) 89-289-13473

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Abstract

The synthesis and an exemplary catalytic application of a SBA-15-supported rhodium–N-heterocyclic carbene (NHC) complex is reported. In contrast to the conventional method of immobilization of unsaturated NHC complexes, the rhodium–NHC compound described here is connected to the SBA-15 surface by a linker originating from the backbone of the unsaturated NHC ligand. The unique characteristics of the new immobilization mode enable the supported NHC complexes to maintain two unchanged “wing-tip” ligands. This method of immobilization of unsaturated NHC complexes provides a new way to maintain the original configuration of homogeneous NHC complexes in the heterogenized catalytic system. The immobilized rhodium–NHC catalyst is used in a hydrogenation reaction with styrene as substrate.

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