Rinesch, Torsten Bolm, Carsten Cobalt-Catalyzed Oxidation of the β‑O‑4 Bond in Lignin and Lignin Model Compounds In this work we demonstrate the use of Co­(acac)<sub>3</sub> in combination with <i>N</i>-hydroxyphthalimide as an oxidant for the selective α-oxidation of the representative β-O-4 linkages in lignin model compounds. The oxidation reaction proceeds under mild conditions at 80 °C using 1,4-dioxane as the solvent and an oxygen atmosphere. The prior α-oxidation in the β-O-4 linkage of the lignin polymer is known to result in an easier cleavage of the adjacent C–O and C–C bonds because of a decrease in bond stability. Finally, the conditions were successfully transferred to kraft- and organosolv-lignin samples as proven by 2D-NMR (HSQC) experiments and gel permeation chromatography measurements. gel permeation chromatography measurements;HSQC;lignin model compounds;α- oxidation;Lignin Model Compounds;D-NMR;oxidation reaction proceeds;representative β- O -4 linkages;β- O -4 linkage;bond 2018-07-30
    https://acs.figshare.com/articles/journal_contribution/Cobalt-Catalyzed_Oxidation_of_the_O_4_Bond_in_Lignin_and_Lignin_Model_Compounds/6879497
10.1021/acsomega.8b00994.s001