Abstract
The interaction of methylidenetrialkylphosphoranes with Mo(O)2(mes)2(mes=mesityl=2,4,6-C6H2Me3) affords the first dioxo-metal phosphorus-substituted alkylidenes (mes)(O)2Mo=C(mes) PR3. X-ray structure (R = n−Bu3) as well as 13C and 31P NMR spectroscopy indicate substantial double bond character for the Mo-Ccarb bond in these complexes. As shown by variable-temperature NMR experiments these species exhibit interesting molecular dynamic processes and barriers to rotation have been estimated. The mechanism of formation of the dioxophosphinomethylidene complexes implies unprecedented double Hα abstraction and mesityl migration from molybdenum to the ylidic carbon atom in dioxo phosphonium complexes which have been isolated and fully characterized by NMR (R = n−Bu and i-Pr) and X-ray diffraction (R = n−Bu).
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© 1989 Kluwer Academic Publishers
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Lai, R. (1989). Dioxophosphinomethylidene Molybdenum (VI) Complexes. In: Schubert, U. (eds) Advances in Metal Carbene Chemistry. NATO ASI Series, vol 269. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-2317-1_22
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DOI: https://doi.org/10.1007/978-94-009-2317-1_22
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