三聚体
化学
部分
催化作用
木质素
环氧化物
二聚体
有机化学
生物炼制
生物高聚物
苯乙酮
聚合物
原材料
作者
Maarit Lahtinen,Anssi Haikarainen,Jussi Sipilä
出处
期刊:Holzforschung
[De Gruyter]
日期:2012-09-04
卷期号:67 (2): 129-136
被引量:6
摘要
Abstract Lignin, as the second most abundant biopolymer on earth, is one of the targets for plant biorefinery studies. Its complex chemical behavior is frequently studied by dimeric, trimeric, etc. model compounds, preferably with a β- O -4-type structure. In the present study, a convenient synthesis of a β- O -4-type trimeric model compound possessing a free syringylic hydroxyl has been investigated. Two key modifications were in focus: (1) Protection of the aliphatic hydroxyl groups of the starting phenolic dimer prior to the S N 2 displacement reaction before introducing the syringylic moiety with 2,2-dimethoxypropane. (2) The hydroxymethylation step to introduce the full side chain moiety. When this reaction was performed in dioxane/water in the presence of a catalytic amount of KOH instead of K 2 CO 3 , the formation of a side product via dehydration was markedly reduced. In addition, a convenient method for introducing an α,β-epoxide structure in acetophenone is recommended.
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