Intramolecular cyclization via ring closure at thiophenic sulphur (cyclo-S-alkylation) gives the new trigonally bonded bridged sulphonium heterocycle, 6,7,8,9-tetrahydro-10-methylthiopyrano[1,2-α]benzothiophenium ion.
J. A. Cotruvo and I. Degani, J. Chem. Soc. D, 1971, 436 DOI: 10.1039/C29710000436
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