Summary
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1.
A study was made of the action of dilute nitric acid solutions on wood- saponification lignin in the temperature range 42–50°. It was shown that saponification lignin reacts with dilute nitric acid at temperatures as low as 42°.
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2.
When saponification lignin is treated with dilute nitric acid, the content of carboxy groups increases to about 10%, but the amount of methoxy groups is reduced.The nitrogen content does not exceed 3.56%.
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3.
Apart from nitrolignin, 4,6-dinitroguaiacol and oxalic acid were isolated from the reaction mixture.
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Sergeeva, L.L., Chuksanova, A.A. & Shorygina, N.N. Action of dilute nitric acid on saccharification lignin. Russ Chem Bull 6, 668–670 (1957). https://doi.org/10.1007/BF01169292
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DOI: https://doi.org/10.1007/BF01169292