Liquid phase autoxidation of p-methoxytoluene to p-anisaldehyde in water-acetic acid medium (10-90% vol.) using cobalt acetate as a catalyst has been investigated under or not electrolysis between two graphite electrodes. The rate of formation of anisaldehyde is strongly increased under electrolysis condition : the maximum anisaldehyde yield occurs at t=70 min whereas this maximum is reached only after t=5 h 30 min without electrolysis.