The salient and specific features of 1,2-cyclooctanediol oxidation with hydrogen peroxide to suberic acid in the presence of various catalytic systems were studied. The oxidation of 1,2-cyclooctanediol with such a mild and environmentally friendly oxidizing agent as hydrogen peroxide was shown to yield high-purity suberic acid containing no admixtures of dicarboxylic acids with a smaller number of carbon atoms by carrying out the reaction in a heterogeneous system with a hydrocarbon solvent for the diol.