The heterocyclization of N,N'-diarylformamidines with phosphorus trichloride to form 1,4,2,5-diazadiphosphorinanes was found to proceed via the key stage of aliphatic electrophilic ylide substitution at the formamidine carbon atom.
G. V. Oshovsky, A. M. Pinchuk, A. N. Chernega, I. I. Pervak and A. A. Tolmachev, Mendeleev Commun., 1999, 9, 38 DOI: 10.1070/MC1999v009n01ABEH001023
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