Conclusions
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1.
The lignin of the lignocarbohydrate complex, obtained by mechanical grinding from spruce wood, and of its low-molecular fraction, in its qualitative composition resembles spruce protolignin.
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2.
The observed complete decomposition of the lignocarbohydrate linkages of the low-molecular fraction of the lignocarbohydrate complex under the influence of the e−+Na+ system makes it possible to assume that these linkages can be: aryl-O-aryl and aryl-O-alkyl, including aryl-O-benzyl, benzyl-O-alkyl, aryl-glycoside and benzyl-glycoside linkages.
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3.
A dimer, representing a diphenylmethane derivative, was detected for the first time in the products obtained by the decomposition of the lignin of the lignocarbohydrate complex with sodium in liquid ammonia.
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4.
On the basis of the molecular-weight distribution curves of the carbohydrate products of the decomposition it may be assumed that the lignin in the investigated lignocarbohydrate complex serves as a crosslink between two and more polysaccharide chains.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 12, pp. 2812–2815, December, 1973.
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Éfendieva, N.F., Shorygina, N.N. & Krasovskaya, N.P. Reductive cleavage of lignocarbohydrate complex by sodium metal in liquid ammonia. Russ Chem Bull 22, 2748–2751 (1973). https://doi.org/10.1007/BF00926159
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DOI: https://doi.org/10.1007/BF00926159