1,3-Diphenylbenzo[c]thiophene dianion, (1)2– a member of the novel series of 4nπ polyheterocyclic dianions, has been prepared and characterized by n.m.r.; it shows a high stability and a peculiar charge distribution pattern in which the sulphur atom polarizes the charge towards the α-positions.
Y. Cohen, J. Klein and M. Rabinovitz, J. Chem. Soc., Chem. Commun., 1987, 1538 DOI: 10.1039/C39870001538
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