Constant-current electrolysis of geranyl acetate (2) in CH3CN-H2O afforded eight oxidation products (3-10) which were presumed to be formed through initial oxidation of the double bond at C6-C7. Based on the results of electrolysis of 2 in CH3CN-H218O, we have found that the oxygen atom(s) in the products (3-10) is(are) derived from water used as the reaction medium.