Thiazane-2, 4-dithione and its 3-aryl derivatives

Reaction of 2-thiothiazane-4-one and its 3-aryl derivatives with phosphorus pentasulfide in toluene or dichloroethane gives thiazane-2, 4-dithione, or the corresponding 3-aryl derivatives. The compounds are characterized by absorption maxima (or bends) at three bands, 244–262, 315–321, and 339–350 m. The IR spectra exhibit bands at 14.93 (C-S-C), 6.64, and 6.84 (N-C-S), and 7.34, 8.43, 7.14 (CH₂).