"Homobimetallic Ruthenium-Ethylene, Vinylidene, Allenylidene, and Indenylidene Catalysts for Olefin Metathesis"

Xavier Sauvage, Yannick Borguet, Albert Demonceau, and Lionel Delaude

journal cover 
          source: Macromolecular Symposia
            year: 2010
          volume: 293
      first page: 24
       last page: 27
             doi: 10.1002/masy.200900044

Abstract: Following the discovery of bimetallic ruthenium scaffold (1), two new homobimetallic ruthenium-N-heterocyclic carbene complexes (2,3) were synthesized and found highly suitable for promoting ROMP, RCM, and CM reactions. Results from this study indicated that the ethylene ligand was highly labile and that adding a small amount of a terminal alkyne to the reaction media had a beneficial influence on the metathetical activity. These observations prompted us to further investigate the role of the alkyne co-catalyst. Thus, homobimetallic ruthenium-arene complexes bearing vinylidene (4,5), allenylidene (6), and indenylidene (7) ligands were prepared from complex 1 and propargyl alcohol derivatives. Their catalytic activities were probed in several types of olefin metathesis reactions, and they were found valuable intermediates for the safe and efficient one-pot synthesis of the Hoveya-Grubbs isopropoxybenzylidene catalyst (8).

Keywords: Arene Ligands, N-Heterocyclic Carbene, Olefin Metathesis, Organometallic Catalysts, Phosphine Ligands

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