Abstract
Benzo[b]thieno[2,3-c]pyrylium perchlorates were obtained in high yields in the acylation of benzo[b]thien-3-ylacetone with aliphatic acid anhydrides in the presence of 70% perchloric acid. Treatment of the products with ammonia converts them to benzo[b]thieno[2,3-c]pyridines (in yields higher than 90%), whereas hydroxy and dialkylamino derivatives of dibenzothiophene were obtained in up to 50% yields by treatment of the products with alkalis or secondary amines, respectively.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1351–1354, October, 1981.
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Dulenko, V.I., Tolkunov, S.V. & Alekseev, N.N. Synthesis and reactions of benzo[b]thieno[2,3-c]pyrylium pairs. Chem Heterocycl Compd 17, 1010–1013 (1981). https://doi.org/10.1007/BF00503530
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DOI: https://doi.org/10.1007/BF00503530