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Year 2007, Month 4 (Section Full Articles, Page 774)

Phosphorus
containing derivatives of 2,6-di(tert-butyl)phenol: the antioxidant activity and properties of the corresponding phenoxyl radicals

V. Yu. Tyurin, Yu. A. Gracheva, E. R. Milaeva,
A. A. Prishchenko, M. V. Livantsov, O. P. Novikova, L. I. Livantsova, A. V. Maryashkin, M. P. Bubnov, K. A. Kozhanov, and V. K. Cherkasov

The properties of phenoxyl radicals generated by the oxidation of mono-, di-, and triphosphorus derivatives of 2,6-di(tert-butyl)
4
methylphenol (ionol) were studied by ESR. These compounds exist as conformers that are interconvertible with a temperature
dependent rate. Numerical processing of the ESR spectra gave the thermodynamic and activation parameters that characterize the interconversion of the conformers. The antioxidant activities of the compounds were studied in a model oxidation of oleic acid and with biological objects. These phenols efficiently inhibited radical oxidation reactions.

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