Abstract
4H-Chromenes were found to be acylated at the 3-position by the action of acetic anhydride and perchloric acid. The structure was determined of other reaction products — the indenobenzopyrylium and 2,4-diaryl-1-benzopyrylium salts.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1042–1046, August, 1990.
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Suzdalev, K.F., Koblik, A.V. Acylation of 2,4-diaryl-4H-chromenes by the action of acetic anhydride and perchloric acid. Chem Heterocycl Compd 26, 870–873 (1990). https://doi.org/10.1007/BF00480858
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DOI: https://doi.org/10.1007/BF00480858