Abstract
We have studied the oxidation of 4H-chalcogenopyrans and chalcogenopyrylium salts by lead tetraacetate. We have established that the major reaction products on oxidation of 2,6-diphenyl-4H-thiopyran and selenopyran are 2,6-diphenyl-4H-thio(seleno)pyran-4-ones, while 2-benzoyl-5-phenyl(seleno)thiophenes are formed as impurities. The major product on oxidation of 2,6-diphenyl-4H-pyran is 2-benzoyl-5-phenylfuran. We have shown that 2,4,6-triphenyl-4H-pyran does not undergo oxidation by hydrogen peroxide in neutral medium, in contrast to its S and Se analogs. This supports the hypothesis that the heteroatom participates in the oxidation process.
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N. G. Cherynshevskii Saratov State University, Saratov 410071. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 7, pp. 913–916, July, 1996. Original article submitted March 6, 1996.
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Drevko, B.I., Smushkin, M.I. & Kharchenko, V.G. Oxidation reactions of 4H-chalcogenopyrans. Chem Heterocycl Compd 32, 777–780 (1996). https://doi.org/10.1007/BF01165719
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DOI: https://doi.org/10.1007/BF01165719