Abstract
It is shown that 2-aryloxy-3-benzoyl-6-methylpyridines undergo cyclization to the corresponding derivatives of 10-phenyl-10-hydroxy-10H-pyrido[2,3-b]chromenes under the influence of concentrated sulfuric acid in glacial acetic acid. The pKR+ values of the products, which range from −6.28 to −9.27 and correlate with the σp 0 and σR 0 meta substituent constants, depending on the position of the substituent, were determined by spectrophotometry.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 798–800, June, 1982.
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Petrichenko, V.M., Konshin, M.E. Synthesis and properties of substituted 10-phenyl-10-hydroxy-10H-pyrido[2,3-b]chromenes. Chem Heterocycl Compd 18, 605–607 (1982). https://doi.org/10.1007/BF00506153
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DOI: https://doi.org/10.1007/BF00506153