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