It is suggested that all displacements at phosphorus in a four-membered ring proceed via trigonalbipyramidal intermediates in which the ring spans an apical-equatorial position, the rate, relative to displacement at acyclic phosphorus, depending on the electronegativity of the displaced group.
J. R. Corfield, N. J. De'ath and S. Trippett, J. Chem. Soc. D, 1970, 1502 DOI: 10.1039/C29700001502
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