In connection with oxidation of methyl linoleate with oxygen at 70-110°reported previously, the carbonyl compounds produced from hydroperoxides formed by this oxidation were examined. Besides the known methyl ester of formyloctanoic acid and hexanal, reported to have been formed by autoxidation of methyl linoleate, 2-octenal, 2, 4-nonadienal, methyl monoepoxyoctadecenoate, and another smalll quantity of substance assumed to be methyl formylundecenoate were detected as the oxidation products of methyl linoleate by means of gas chromatography and thin-layer chromatography of their p-nitro and 2, 4-dinitro-phenylhydrazones. The oxidation products of methyl linoleate by oxygen were compared with those obtained by periodate oxidation of epoxidized methyl linoleate (methyl monoepoxyoctadecenoate). Formation of malonaldehyde from methyl linoleate by air oxidation was also discussed.