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By means of preparative GLC, 1‐octen‐3‐ol and 2‐trans‐heptenal could be isolated from mildly oxidized linoleic acid ester and from oils containing this acid (e.g., soybean oil). A hypothesis for the origin of these two substances in natural products is given. The absence of 2‐trans‐octenal in the cleavage products from methyl linoleate, its presence in oils and the controversial experimental results obtained by various investigators, seem to be reconcilable by assuming the formation of an acetal. The suggested acetal may, on intermolecular cyclic rearrangement and cleavage, give 1‐octen‐3‐ol.