4H-Thiapyran-4-thiones are ring-opened by nucleophiles in dimethyl sulphoxide or NN-dimethylformamide giving intermediates which are oxidised to 6a-thiathiophthenes or 3-acylmethylene-1,2-dithioles.
J. G. Dingwall, D. H. Reid and J. D. Symon, J. Chem. Soc. D, 1969, 466a DOI: 10.1039/C2969000466A
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