Substituted 4-(naphthyl- and phenyl-thio)-4-methylpentan-2-ones (I)–(VI) undergo cyclodehydration by polyphosphoric acid at 100 °C to give thiochormens (VII)–(XII) which, under these conditions, rearrange with ring contraction to the corresponding fused thiophens (XIII)–(XVIII).
D. D. MacNicol and J. J. McKendrick, J. Chem. Soc., Perkin Trans. 1, 1974, 2493 DOI: 10.1039/P19740002493
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