The reaction of tetraphenyldiphosphine with S4N4 in toluene produces the six-membered heterocycle Ph2PS2N3, the structure of which has been determined by X-ray crystallography; the structural parameters and electronic spectrum of the PS2N3 ring are consistent with an 8-electron π-system.
N. Burford, T. Chivers, R. T. Oakley, A. W. Cordes and P. N. Swepston, J. Chem. Soc., Chem. Commun., 1980, 1204 DOI: 10.1039/C39800001204
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