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ConclusionsThe photochemical generation of peroxy radicals enables the direct determination of rate coefficients of the reaction of these radicals with alcohols.According to Howard, Schwalm and Ingold [ 3 ] secondary peroxy radicals are about 3-5 times more reactive in hydrogen abstraction reactions than tertiary ones. Comparing our results with those of Kroo et al.[lS], who investigdted the reactions of 2-cyano-2-propyl peroxy radicals with I-phenyl ethanol and benzyl alcohol as well, we obtain a factor o f 5 -5.5 at T = 55 C. Our values, however, seem to be somewhat higher than the rate coefficient of the reaction between a-hydroxyl-benzylperoxy radicals and benzyl alcohol measured by Howard and Korcek [8].The temperature dependence of the reaction between 1-phenylethyl peroxy radicals and 1-phenyl ethanol is in very good agreement with the data of Hajdu et al. Oxid. Commun. 6, 371 (1984).J. Chem. Kinet. 18, 31 (1986).( 1 988

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