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The mechanism of the formation of quinonic acids in the oxidation of the bark of the Siberian larch. II

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Summary

1. It has been shown by chemical and physicochemical methods of analysis that the oxidation of bark lignin by atmospheric oxygen in nitric acid is accompanied by oxidative-condensation and oxidative-hydrolytic processes.

2. Oxidative condensation leads to the formation of a stable intermediate product with a quinoid system of bonds. This complex fragments under the oxidative-hydrolytic action of the medium. The oligomers obtained undergo oxidative-condensation transformations more readily. Such reactions probably take place successively as far as the formation of relatively simple compounds.

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Literature cited

  1. V. V. Ershov, G. A. Nikiforov, and A. A. Volod'kin, Sterically Hindered Phenols [in Russian], Moscow (1972), p. 350.

  2. M. I. Chudakov and M. G. Okun', some Lignin-Condensation Processes in Hydrolysis [in Russian], Moscow (1965).

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  10. L. N. Davydova and É. D. Levin, The Quinone Nitropolycarboxylic Acids Obtained in the Oxidation of Siberian Larch Bark [in Russian], Krasnoyarsk, No. 5 (1974), pp. 151–155.

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Authors
  1. É. D. Levin
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  2. L. N. Davydova
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  3. N. A. Chuprova
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Additional information

Siberian Technological Institute, Kransoyarsk. Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 409–412, May–June, 1977.

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Levin, É.D., Davydova, L.N. & Chuprova, N.A. The mechanism of the formation of quinonic acids in the oxidation of the bark of the Siberian larch. II. Chem Nat Compd 13, 344–347 (1977). https://doi.org/10.1007/BF00573558

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  • DOI: https://doi.org/10.1007/BF00573558

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