Methinecyanines have been prepared from 1,2- and 1,3-dithiolium salts. The violet compound, previously thought to be a C-betaine derived from bis-[3-(benzo-1,2-dithiole)]methinecyanine, is shown to be 2-(benzo-1,2-dithiol-3-ylidene)-2,3-dihydrobenzo[b]thiophen-3-thione. Two by-products, obtained during an unambiguous synthesis of the latter compound, are shown to be derivatives of 6H-dibenzo[b,f]thieno[3,2-b]thiopyran.
D. B. J. Easton, D. Leaver and D. M. McKinnon, J. Chem. Soc. C, 1968, 642 DOI: 10.1039/J39680000642
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