The methylenephosphine MesP![[double bond, length as m-dash]](https://www.rsc.org/images/entities/char_e001.gif)
C(SiMe3)2[(1)Mes = mesityl] is smoothly oxidized by elemental sulphur to the 3-membered ring system Mes[graphic omitted](SiMe3)2,(3), which, upon treatment with Bun3P, is converted into the 3-co-ordinate phosphorane MesP(S)C(SiMe3)2, (2); the nearly isostructural nature of compounds (2) and (3) is confirmed by their X-ray crystallographic analyses.
M. Caira, R. H. Neilson, W. H. Watson, P. Wisian-Neilson and Z. Xie, J. Chem. Soc., Chem. Commun., 1984, 698 DOI: 10.1039/C39840000698
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