NMR Assignment for Diaryl Ether Structures (4–O–5 Structures) in Pine Wood Lignin
作者:Yanding Li、Takuya Akiyama、Tomoya Yokoyama、Yuji Matsumoto
DOI:10.1021/acs.biomac.6b00257
日期:2016.6.13
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
合成了在每个侧链部分带有β–O–4键的4–O–5四聚体木质素模型化合物,以及4–O–5偶联的脱氢二癸二烯醇。通过与他们的NMR数据进行比较,将DMSO- d 6中记录的松木木材木质素的HSQC光谱中的两个交叉信号分配给4–O–5连接单元的芳环上的H2 / C2和H6 / C6相关性。尽管H2 / C2相关峰出现在与丁香基单元相同的区域中,但松木质素的硝基苯氧化并没有产生任何丁香基型产物,但会释放出4–O–5型产物。