Benzylidene derivatives of benzo[b]thiophen-2-one undergo base-catalysed ring opening and reclosure to produce high yields of 2-aryl-2,3-dihydrobenzo[b]-thiophen-3-carboxylic acids.
R. A. Conley and N. Heindel, J. Chem. Soc., Chem. Commun., 1975, 207 DOI: 10.1039/C39750000207
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