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Antioxidative activity of hydroxylamines. ESR spectra of radicals derived from hydroxylamines

The antioxidative activity of hydroxylamines was evaluated for the oxidation of tetralin at 61°C and linoleic acid micelles in an aqueous dispersion at 37°C, induced by an azo initiator. The antioxidative efficacy of the hydroxylamines for the oxidation of tetralin was smaller than that of α-tocopherol. However, the hydroxylamines showed more potent antioxidative activity than that of the α-tocopherol against the oxidation of linoleic acid micelles. On the basis of the results of an ESR study and the oxidation product obtained, it is suggested that active position in hydroxylamines depend not only on hydroxyl hydrogen-atom, but also on the allylic hydrogen atom.