The electrooxidation of the liquid fraction or liquor, containing predominantly lignin and obtained from pre-treating lignocellulose (250 mg), was studied in a two-compartment electrochemical cell with a three-electrode setup. For this purpose, the anodic conditions were initially optimised using the lignin model substrate 1-(3,4-dimethoxyphenyl)-2-(2methoxyphenoxy)propane-1,3-diol, which contains a b-O-4 linkage between two phenyl rings that mimics those ubiquitously found in lignin (see Figure and Figure ). and Table ). The obtained 3,4dimethoxybenzaldehyde was measured by 1 H nuclear magnetic resonance (NMR) in CDCl3