Benzo[b]thiophene dianion (1)2–, the first sulphur-containing 4nπ polycyclic dianion, was prepared via metal reduction and characterised by 1H and 13C n.m.r. spectroscopy; the reaction products depend on the reduction conditions.
Y. Cohen, J. Klein and M. Rabinovitz, J. Chem. Soc., Chem. Commun., 1985, 1033 DOI: 10.1039/C39850001033
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