While the treatment of chalcone with anhydrous sodium polysulphide in anhydrous ethanol gave 2,4-dibenzoyl-3,5-diphenylthiolan, which was dehydrogenated to the corresponding thiophen for structure confirmation, the same two reactants in anhydrous 1,2-dimethoxyethane gave 1,3-diphenyl-3-thioxopropan-1-one.
R. T. LaLonde, J. Chem. Soc., Chem. Commun., 1982, 401 DOI: 10.1039/C39820000401
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