Lithiated bis-sulphides (2) in tetrahydrofuran undergo at room temperature, preferably in the presence of some hexamethylphosphoric triamide, a ring closure to 2-(methylthio)thiophen (4)via nucleophilic attack on sulphur.
R. H. Everhardus, H. G. Eeuwhorst and L. Brandsma, J. Chem. Soc., Chem. Commun., 1977, 801 DOI: 10.1039/C39770000801
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