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Olefin Metathesis Featuring Ruthenium Indenylidene Complexes with a Sterically Demanding NHC Ligand

Authors

  • César A. Urbina-Blanco,

    1. EaStCHEM School of Chemistry, University of St Andrews, KY16 9ST, St Andrews (UK), Fax: (+44) 1334-463808
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  • Anita Leitgeb,

    1. Institute for Chemistry and Technology of Materials, Graz University of Technology, Stremayrgasse 9, 8010 Graz (Austria)
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  • Prof. Dr. Christian Slugovc,

    Corresponding author
    1. Institute for Chemistry and Technology of Materials, Graz University of Technology, Stremayrgasse 9, 8010 Graz (Austria)
    • Institute for Chemistry and Technology of Materials, Graz University of Technology, Stremayrgasse 9, 8010 Graz (Austria)
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  • Dr. Xavier Bantreil,

    1. EaStCHEM School of Chemistry, University of St Andrews, KY16 9ST, St Andrews (UK), Fax: (+44) 1334-463808
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  • Dr. Hervé Clavier,

    1. EaStCHEM School of Chemistry, University of St Andrews, KY16 9ST, St Andrews (UK), Fax: (+44) 1334-463808
    2. Present address: Institut des Sciences Moléculaires de Marseille, Université Aix-Marseille, UMR CNRS 6263, Av. Escadrille Normandie Niemen, 13397 Marseille Cedex 20 (France)
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  • Prof. Dr. Alexandra M. Z. Slawin,

    1. EaStCHEM School of Chemistry, University of St Andrews, KY16 9ST, St Andrews (UK), Fax: (+44) 1334-463808
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  • Prof. Dr. Steven P. Nolan

    Corresponding author
    1. EaStCHEM School of Chemistry, University of St Andrews, KY16 9ST, St Andrews (UK), Fax: (+44) 1334-463808
    • EaStCHEM School of Chemistry, University of St Andrews, KY16 9ST, St Andrews (UK), Fax: (+44) 1334-463808
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Abstract

The synthesis and characterization of two new ruthenium indenylidene complexes [RuCl2(SIPr)(Py)(Ind)] 6 and [RuCl2(SIPr)(3-BrPy)(Ind)] 7 featuring the sterically demanding N-heterocyclic carbene 1,3-bis(2,6-di isopropylphenyl)-4,5-dihydroimidazol-2-ylidene (SIPr) are reported. Remarkable activity was observed with these complexes in ring closing, enyne, and cross metathesis of olefins at low catalyst loadings. The performance of SIPr-bearing complexes 6 and 7 as well as [RuCl2(SIPr)(PCy3)(Ind)] 5 in ring opening metathesis polymerization is also disclosed. This work highlights the enormous influence of the neutral “spectator” ligands on catalyst activity and stability.

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