Effect of Methoxy Substituents on Wet Peroxide Oxidation of Lignin and Lignin Model Compounds: Understanding the Pathway to C₄ Dicarboxylic Acids

Lignin depolymerization through peroxide oxidation produces dicarboxylic acids (DCA), especially C4-DCA, like succinic acid. In this work, the effect of methoxy substituents on C4-DCA production using lignin model compounds (p-hydroxybenzoic acid, vanillic and syringic acid) hardwood softwood samples was studied. It concluded that increased reactivity toward oxidation. The acid yield higher for with fewer groups, achieving 5.8 wt % p-hydroxybenzoic For Eucalyptus globulus kraft (hardwood guaiacyl syringyl units), an verified, more (3.5 %) produced in a shorter time, comparatively Indulin AT (softwood lignin, only which 2.7 %. This evidence suggests E. might be better raw material than by