Condensed thiophens are obtained by heating aryl prop-2-ynyl sulphoxides in a suitable protic solvent via consecutive [2,3] and [3,3] sigmatropic rearrangements, ketolization, and SN2′ attack of the solvent molecule.
Y. Makisumi and S. Takada, J. Chem. Soc., Chem. Commun., 1974, 848 DOI: 10.1039/C39740000848
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