Thiolates were found to add to methoxytropenylium fluorosulphonate in dichloromethane at –50 °C to give exclusively the stable 1-methoxy-7-(alkyl- or arylthio)cycloheptatrienes in what constitutes the first regiospecific base addition to the tropenylium system.
M. Cavazza, G. Morganti and F. Pietra, J. Chem. Soc., Chem. Commun., 1978, 710 DOI: 10.1039/C39780000710
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