The effect of organic bromides on the rate of the autoxidation of toluene to benzoic acid, catalysed by cobalt(III) acetate in acetic acid at 90°, has been studied. The addition of organic bromides such as bromobenzene, 1,2-dibromoethane, n-butyl bromide, and benzyl bromide increases the rate and the conversion curves show several inflections. The number of inflections varies with the toluene concentration but not with the concentrations of catalyst and bromides.