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 4 N 4与
乙炔二
甲酸二甲酯的反应产物包括三噻二氮杂(5)和三
硫杂氮杂(6),它们的平面结构由X射线衍射确定,代表了两个新的稳定的10π电子芳环体系。这些结构可以更正先前的分配。