Oleic, linoleic, and linolenic esters and olive, sunflower, linseed, rapeseed, hydrogenated rape‐seed, and coriander oils have been oxidized by the permanganate‐periodate reagent. The relative amounts of the dibasic acids and of the mono‐basic acids produced were determined by gas liquid chromatography (GLC). These results were used in combination with the compositions of the oils, also found by GLC, to calculate the positions of the double bonds in the unsaturated fatty acids of the oils. Evidence for the presence of small amounts of 11‐octadecenoic acid and other unusual isomers was obtained.
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Tulloch et al. (1964) studied this question.