Abstract
The boundaries of application of the one-step synthesis of flavylium salts on the basis of bromoresacetophenone were extended, and the conditions for heterocyclization of 2′,4′-dihydroxy-5′-bromochalcones to 4-ethoxyflavylium salts were studied simultaneously. It was noted that similar reaction products were obtained in these two variants of the synthesis of the salts. The presence of electronegative substituents and a hydroxy group in the starting aldehydes hinders the formation of flavylium salts.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 170–173, February, 1981.
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Yakovenko, V.I., Oganesyan, É.T. & Dorofeenko, G.N. One-step synthesis of 4-ethoxy-6-bromo-7-hydroxyflavylium salts and the corresponding flavones. Chem Heterocycl Compd 17, 115–118 (1981). https://doi.org/10.1007/BF00507237
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DOI: https://doi.org/10.1007/BF00507237