In the cation of 1,3,5,7-tetramethylcyclohepta[1,2-c][4,5-c′]dithiophen-4-ylium fluoroborate the charge is largely localised on the carbon atom flanked by the two thiophen rings.
T. M. Brown and W. Carruthers, J. Chem. Soc., Perkin Trans. 1, 1981, 2904 DOI: 10.1039/P19810002904
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