Synthesis of cyclomanganated complexes derived from 2,5-diphenyl-1,3,4-oxadiazole and their reactivity with respect to 1,1-diphenyldiazomethane: Evidence for a fluxional trihaptobenzylic coordination mode |
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Authors: | Christophe Michon,Michel Pfeffer,André de Cian |
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Affiliation: | a Laboratoire de Synthèses Métallo-induites, Institut de Chimie, CNRS LC3 UMR 7177, Université Louis Pasteur, 4, rue Blaise Pascal, 67070 Strasbourg Cedex, France b Service de Détermination Structurale, Institut de Chimie, CNRS LC3 UMR 7177, Université Louis Pasteur, 4, rue Blaise Pascal, 67070 Strasbourg Cedex, France |
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Abstract: | The cyclometallation of 2,5-diphenyl-1,3,4-oxadiazole with benzylpentacarbonylmanganese afforded the related mono- and binuclear complexes. The thermolytic coupling of 1,1-diphenyldiazomethane with monometallated 2,5-diphenyl-1,3,4-oxadiazole afforded substantial amounts of a new trihaptobenzylic complex. In the solid state, an X-ray diffraction analysis confirmed the coordination of manganese metal to one of the phenyl groups introduced by the 1,1-diphenyldiazomethane and to one of ligand’s nitrogen centre. In solution, this trihaptobenzylic complex displays a fluxionality which is assumed to be related to the equilibration of its helical Λ and Δ enantiomers. |
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Keywords: | Manganese Diazoalkane Insertion X-ray diffraction Metallacycles |
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