Peroxide products of oleic acid ozonolysis treated with semicarbazide and hydroxylamine hydrochlorides in methanol are predominantly converted into methyl nonanoate and dimethyl nonanedioate, in 2-propanol, into isopropyl nonanoate and monoisopropyl ester of nonanedioic acid, and also into nonanenitrile, in tetrahydrofuran and in a mixture of acetic acid with dichloromethane, into nonanoic and nonanedioc acids, and also in nonanal oxime and 9-(hydroxyimino)nonanoic acid.Oleic [(9Z)-octadec-9-enoic] acid 1 is present in the composition of nearly all natural fats and oils. One of its main sources is olive (~80%), and also sunflower (39%) and cottonseed (35%) oils, in animal fats it constitutes 36-45% of the overall amount of fatty acids [1].