Ligninに関する研究(第15報) : Phenol化とsulfon化との関係について(1)

概要

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By treatment of protolignin and soild lignosulfonate with phenols alcohol solution in the presence of HCl or reacting partialy phenolated lignin with sulfite solution, the type of active group in protolignin was discussed. Active group sulfonated in protolignin had the following properties : 1). Sulfonyl group in the solid lignosulfonate was readily desulfonated with phenol in the presence of a small amount of HCl. But, a part of sulfonyl group in lignosulfonate was only desulfonated with the same phenolation.2). Phenol lignin was not sulfonated with bisulfate at lower pH. i. e., normal sulfite cooking solution.3). The fact that the etherification of hydroxyl group with diazomethane or dimethyl sulfate prevented the combination of phenols to protolignin, indicated that phenolic or enolic hydroxyl and free alcoholic hydroxyl groups play an important role of phenolation.4).The full dimethyl sulfate-methylated wood reacted with phenol alcohol solution in the presence of HCl. This fact indicated that a part of phenolation may still take place by the formation of a new active group e. g. by hydrolysis on oxygen bridge.
日本森林学会の論文
1954-12-25