In a synthesis capable of extension, 2-phenyl-1,3,2-dioxaphospholan reacts at room temperature with phenyl azide followed by diols, o-dihydroxyarenes, or o-hydroxythiophenol to give phosphoranes (68–100%) including the first isolated phosphoranes containing 7- and 8-membered alicyclic rings, i.e. 2,2-ethylenedioxy-2-phenyl-1,3,2-dioxaphosph(V)epan and 2,2-ethylenedioxy-2-phenyl-1,3,2-dioxaphosph(V)ocan.
J. I. G. Cadogan, N. J. Stewart and N. J. Tweddle, J. Chem. Soc., Chem. Commun., 1979, 191 DOI: 10.1039/C39790000191
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