The acylation of dithienylmethanes, a bis(benzothienyl)methane, and a bis(benzothienyl) sulphide gives, respectively, benzodithiophenes, a condensed analogue, and a thiapyrylium salt, by a direct Bradsher reaction.
M. Ahmed, J. Ashby and O. Meth-Cohn, J. Chem. Soc. D, 1970, 1094 DOI: 10.1039/C29700001094
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