Effects of lignin structure and solvent on the formation rate of quinone methide under alkaline conditions
-
Fuyu Yamauchi
and
Yuji Matsumoto
Abstract
The purpose of this study was to examine how differences in the type of aromatic nucleus, side-chain structure and type of solvent affect the formation rate of quinone methide (QM) in the alkaline reaction of lignin. The reaction was done at a NaOH concentration of 1.0 mol l−1 and temperature of 75–140°C under an anaerobic condition. The formation rates of QM were in the order: syringyl > guaiacyl > p-hydroxyphenyl, when model compounds with lignin-type aromatic nuclei were compared. This and other results on various phenolic compounds suggested that the formation of QM is rapid from compounds having a high electron density in the aromatic π-electron system. The formation of QM was faster from a C6-C2-type than from a C6-C1-type lignin model compound, which was attributed to the fact that QM is an alkene and hence more stable when an unsaturated carbon in QM has an alkyl substituent, like the C6-C2-type compound. When aqueous 1,4-dioxane solutions with different 1,4-dioxane contents were used, the formation of QM became slower with increasing 1,4-dioxane content. This can be explained by the variation in the negative charge density in the rate-determining step, where the density is larger at the transition than at the initial state and consequently the activation energy is lower in a solvent with higher polarity.
Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: None declared.
Employment or leadership: None declared.
Honorarium: None declared.
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Supplementary Material
The online version of this article offers supplementary material (https://doi.org/10.1515/hf-2019-0269).
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Articles in the same Issue
- Frontmatter
- Review
- Wood-based resins and other bio-based binders for the production of mineral wool
- Original articles
- A branched structure provides kraft lignins a denser morphology and a high molar mass for a given hydrodynamic radius
- Effects of lignin structure and solvent on the formation rate of quinone methide under alkaline conditions
- Effect of different catalysts on the oxyalkylation of eucalyptus Lignoboost® kraft lignin
- Preparation of kraft lignin-based activated carbon fiber electrodes for electric double layer capacitors using an ionic liquid electrolyte
- Laccase-catalyzed oxidative modification of lignosulfonates from acidic sulfite pulping of eucalyptus wood
- Reduction of adsorbable organically bound halogens (AOX) formation at near-neutral pH chlorine dioxide bleaching of softwood kraft pulp
- Use of UV resonance Raman spectroscopy for assessing the brightness stability of ozone TCF bleached pulp
- Multi-step purification method of water-soluble oligosaccharides produced from hardwood and softwood
- Structural features of macromolecular components of cork from Quercus suber L.
