The pentaoxyspirophosphorane (1) having a P–OH bond was prepared from the reaction of POCl3 with benzilic acid and isolated as its triethylammonium salt: this compound and the corresponding NN-dimethylformamidinium salt have also been synthesised from the spriophosphorane (2), having a P–H bond, by oxidation with Me2SO.
A. Munoz, B. Garrigues and M. Koenig, J. Chem. Soc., Chem. Commun., 1978, 219 DOI: 10.1039/C39780000219
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