"Ruthenium-Arene Complexes Bearing Imidazol(in)ium-2-dithiocarboxylate Ligands: Evaluation of Their Catalytic Activity in the Synthesis of Enol Esters"

Quentin Willem, François Nicks, Xavier Sauvage, Lionel Delaude, and Albert Demonceau

journal cover 
          source: Journal of Organometallic Chemistry
            year: 2009
          volume: 694
      first page: 4049
       last page: 4055
             doi: 10.1016/j.jorganchem.2009.08.028
graphical abstract

Abstract: The catalytic activity of four ruthenium imidazol(in)ium-2-dithiocarboxylates was evaluated for the synthesis of vinyl esters through addition of 4-acetoxybenzoic acid to 1-hexyne, and compared to those of the parent ruthenium-N-heterocyclic carbene complexes and [RuCl2(p-cymene)(PPh3)] (a standard catalyst). It turned out that ruthenium imidazol(in)ium-2-dithiocarboxylates were poorly active and selective. Quantitative yields, indeed, were obtained only after extended reaction times. However, the catalytic activity could be improved significantly under microwave heating or conventional heating in a sealed tube at 160 °C, driving the reaction to completion in less than 4 h of reaction.

Keywords: Alkynes, Carboxylic Acids, Enol Esters, N-Heterocyclic Carbene Ligands, Microwave, Ruthenium

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