The products of reaction of S4N4 with dimethyl acetylenedicarboxylate include the trithiadiazepine (5) and the trithiatriazepine (6) whose planar structures, determined by X-ray diffraction, represent two new stable 10π electron aromatic ring systems; these structures correct previous assignments.
S. T. A. K. Daley, C. W. Rees and D. J. Williams, J. Chem. Soc., Chem. Commun., 1984, 55 DOI: 10.1039/C39840000055
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