Exceptionally stable spirocyclic oxyphosphoranes were prepared by potassium permanganate oxidation of bis-o-tolylarylphosphine oxides followed by acidification, probably involving nucleophilic attack by a phosphine oxide oxygen atom on a carboxylic carbonyl group.
Y. Segall, I. Granoth, A. Kalir and E. D. Bergmann, J. Chem. Soc., Chem. Commun., 1975, 399 DOI: 10.1039/C39750000399
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