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The cleavage of the linkage bonds among the C9 units in lignin molecules via selective oxidation method to obtain small-weight aromatic compounds is an important way to lignin valorisation. In this study, the cleavage pathways of bonds in a lignin model compound, GGE (guaiacylglycerol- β -guaiacyl ether), by the reactive oxygen species (ROS) in situ generated through electrochemical oxygen reduction reaction (ORR) in an aprotic ionic liquid ([BMIM]BF 4 ) was investigated. The results indicated that when the main ROS was ·OOH, coniferyl alcohol, guaiacol and vanillin were detected as the degradation products which is supposed to be caused by  β -O-4 bonds cleavage; Otherwise, when HO 2 −  was the main ROS, coniferyl alcohol could not be detected and the degradation reaction is believed to be trigerred by C α -C β bonds cleavage.

Degradation of a Lignin Model Compound by ROS Generated In Situ through Controlled ORR in Ionic Liquid