Acyclic phosphoranes, ArnP(OR)5–n with n= 0–3 are shown to hydrolyse in neutral conditions by an SN 1 (P) mechanism for n= 1, 2, and 3 but an SN2 (P) or addition–elimination mechanism for n= 0; this is analogous to the classical SN1 vs. SN2 mechanisms observed reactions at tetrahedral carbon.
N. Lowther and C. D. Hall, J. Chem. Soc., Chem. Commun., 1985, 1303 DOI: 10.1039/C39850001303
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