Easy synthesis of β-O-4 type lignin related polymers
Easy synthesis of β-O-4 type lignin related polymers
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DOI：
10.1039/b416699j
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发表时间：
2005-01-01
影响因子：
3.2
通讯作者：
Ubukata, M
中科院分区：
文献类型：
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作者：
Kishimoto, T;Uraki, Y;Ubukata, M
β-O-4 结构是木质素中最丰富的子结构。使用简单的芳香族化合物作为起始材料制备仅由β-O-4结构组成的木质素相关聚合物。苯乙酮衍生物被溴化，在 K2CO3 存在下聚合，并用 NaBH4 还原，得到木质素相关的聚合物。这些是线性聚合物，其结构类似于天然木质素，尽管它们不具有γ-羟甲基。通过凝胶渗透色谱法用聚合物的全乙酸酯测定数均聚合度(DPn)。愈创木基型聚合物的DPn范围为15.2-21.4，其中紫丁香基型的值为11.3，对羟基苯基型的值为16.9。愈创木基型聚合物非常易溶于常用的木质素溶剂，例如1, 4-二恶烷-水（96:4，v/v）和DMSO，但仅微溶于丙酮-水（9:1，v/v）。
The beta-O-4 structure is the most abundant substructure in lignin. Lignin related polymers composed of only the beta-O-4 structure were prepared using simple aromatic compounds as starting materials. Acetophenone derivatives were brominated, polymerized in the presence of K2CO3 and reduced with NaBH4 to give the lignin related polymers. These are linear polymers which resemble natural lignins in their structures, although they do not have a gamma- hydroxymethyl group. The number average degree of polymerization (DPn) was determined with peracetate of the polymers by gel permeation chromatography. The DPn of guaiacyl type polymers ranged from 15.2-21.4, where the value for the syringyl type was 11.3 and for the p- hydroxyphenyl type 16.9. The Guaiacyl type polymer was very soluble in usual lignin solvents such as 1, 4-dioxane-water ( 96 : 4, v/ v) and DMSO, but only slightly soluble in acetone - water ( 9 : 1, v/ v).