Ligninに関する研究(第VIII報) : Ligninの臭素化反応について(其の2)

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The author brominated the wood powder and the isolated lignin with N/10 solution of bromine in carbon tetrachloride at 2℃., for hours.Bromo-protolignin in the wood, having 53.09% bromine content and corresponding to ca. 2 atoms per the lignin-bilding stone of a molecular weight of 191,was obtained. When the bromo-lignin was heated with 10% alcoholic potassium hydroxide solution, about half of the bromine in bromo-protolignin was split off, giving a brominate with 28.62% bromine. The amount of hydrogen bromine formed corresponded to the amount of bromine which had reacted with the lignin, indicating that substitution reaction was essential.From the similar experimental process, it was found the bromination of the various isolated lignin and the phenol lignin was understood with substitution reaction, and that a part of the bromine content in bromolignin was only split off with 10% alcoholic potassium hydroxide solution.By the analytical results of the brominates of isolated lignin and the phenolate, it has been found that about one atom of bromine reacted with the one bilding stone of the isolated lignin, and in the case of the brominate of phenol lignin, bromine content varied 2.3〜2.8 atoms by the kind of phenolate. (Table 1)On the treatment of the brominates of isolated lignin, the phenolate and bromo-protolignin in wood with an alkaline oxidation reaction in the presence of cobalt hydroxide or copper hydroxide or copper hydroxide, the results as shown in Tables 2 and 3 was obtained.
日本森林学会の論文
1953-11-25

著者

石川久雄
松山農科大学

Ligninに関する研究(第VIII報) : Ligninの臭素化反応について(其の2)

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