Thermolysis of several new 2-(ω-alkenyl)-3-sulpholenes, prepared by direct deprotonation and alkylation of 3-sulpholenes, led to cheletropic extrusion of SO2 followed by intramolecular Diels–Alder reaction to yield the corresponding hydroindans and hydronaphthalenes.
T. Chou, H. Tso and L. Chang, J. Chem. Soc., Chem. Commun., 1985, 236 DOI: 10.1039/C39850000236
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