Ruthenium–arene complexes bearing imidazol(in)ium-2-dithiocarboxylate ligands: Evaluation of their catalytic activity in the synthesis of enol esters |
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Authors: | Quentin Willem, Fran ois Nicks, Xavier Sauvage, Lionel Delaude,Albert Demonceau |
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Affiliation: | aLaboratory of Macromolecular Chemistry and Organic Catalysis, University of Liège, Sart-Tilman (B.6a), B-4000 Liège, Belgium |
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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. |
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Keywords: | Alkynes Carboxylic acids Enol esters N-Heterocyclic carbene ligands Microwave Ruthenium |
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