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A Simple Preparation of Pyridine-Derived N-Heterocyclic Carbenes and Their Transformation into Bridging Ligands by Orthometalation

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  • This work has been supported by the Spanish Ministerio de Ciencia e Innovación (projects CTQ2007-60865 and MAT2006-1997). Fellowships from the University of Carabobo (Venezuela, to M.G.S.-V.) and Xunta de Galicia (Spain, to D.V.-G.) are also acknowledged.

Abstract

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Pyrid-2-ylidenes are trapped in solution by [Ru3(CO)12] after being formed by deprotonation of N-substituted pyridinium cations. The great basicity of these NHC ligands and the polynuclear character of the ruthenium cluster trigger room temperature orthometalation of the initial κ1-C2-pyrid-2-ylidene ligands, leading to unprecedented face-capping κ2-C2,C3-pyrid-3-yl-2-ylidene ligands.

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