The reaction of chlorodiphenylphosphine with S4N4 in acetonitrile produces the six-membered heterocycle (Ph2PN)2NSCl, which is converted into a tricyclic ring on treatment with Me3SiNSNSiMe3; the structures of these new PSN ring systems have been determined by X- ray crystallography.
T. Chivers, M. N. S. Rao and J. F. Richardson, J. Chem. Soc., Chem. Commun., 1982, 982 DOI: 10.1039/C39820000982
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