Li Yanding, Akiyama Takuya, Yokoyama Tomoya, Matsumoto Yuji
Wood Chemistry Laboratory, Department of Biomaterial Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo , Bunkyo-ku, Tokyo 113-8657, Japan.
Japan Science and Technology Agency (JST), PRESTO, Kawaguchi, Saitama 332-0012, Japan.
Biomacromolecules. 2016 Jun 13;17(6):1921-9. doi: 10.1021/acs.biomac.6b00257. Epub 2016 Apr 26.
A 4-O-5-tetramer lignin model compound carrying β-O-4 linkages on each of the side-chain moieties was synthesized, as well as 4-O-5-coupled dehydrodiconiferyl alcohol. By comparison with their NMR data, two cross-signals in the HSQC spectrum of pine milled wood lignin recorded in DMSO-d6 were assigned to H2/C2 and H6/C6 correlations on the aromatic rings of 4-O-5-linked units. Although the H2/C2 correlation peak appeared in the same region as syringyl units, nitrobenzene oxidation of the pine lignin did not yield any syringyl-type product, but did release a 4-O-5-type product.
合成了一种在每个侧链部分均带有β-O-4键的4-O-5-四聚体木质素模型化合物，以及4-O-5-偶联脱氢松柏醇。通过与它们的核磁共振数据进行比较，在氘代二甲亚砜（DMSO-d6）中记录的松树磨木木素的异核单量子相干谱（HSQC）中的两个交叉信号被指定为4-O-5连接单元芳环上的H2/C2和H6/C6相关性。尽管H2/C2相关峰出现在与紫丁香基单元相同的区域，但松树木素的硝基苯氧化没有产生任何紫丁香基型产物，而是释放出一种4-O-5型产物。
