The protonated species, generated from 2,7-di-t-butylthiepine and its 4-methyl and 4,5-dimethyl derivatives with fluorosulphuric acid–SO2 and /or concentrated sulphuric acid, have been shown by 1H n.m.r. examination to possess homothiopyrylium ion structures.
K. Yamamoto, S. Yamazaki, A. Matsukawa and I. Murata, J. Chem. Soc., Chem. Commun., 1984, 604 DOI: 10.1039/C39840000604
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