Carbon disulphide and methyl iodide converted the anhydrobases (3) into 8-[(methylthio)thiocarbonyl]pyridinium iodides (4) which afforded new pyridinium anhydrobases (5) with ethoxide. These anhydrobases rearranged into the isomeric ketene S,S-dithioacetals (6), precursors for disulphides.
A. R. Katritzky and R. T. Langthorne, J. Chem. Soc., Perkin Trans. 1, 1983, 2605 DOI: 10.1039/P19830002605
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