V. Litvinov, T. V. Shchedrinskaya, P. A. Konstantinov
Apr 1, 1975
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Journal
Chemistry of Heterocyclic Compounds
Abstract
It is shown that the catalytic liquid-phase oxidation of 3-methylthieno[2,3-b]-thiophene and 3-methylthieno[3,2-b]thiophene in acetic acid in the presence of cobalt acetate and sodium bromide at 90–110° gives thieno[2,3-b]thiophene-3-carboxylic acid and thieno[3,2-b]-3-formylthiophene, respectively.