Inhibiting effect of 6-methyluracil derivatives on the free -radical oxidation of 1,4-dioxane |
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Authors: | L R Yakupova A V Ivanova R L Safiullin A R Gimadieva Yu N Chernyshenko A G Mustafin I B Abdrakhmanov |
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Institution: | 1.Institute of Organic Chemistry,Ufa Research Center of the Russian Academy of Sciences,Ufa,Russian Federation |
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Abstract: | The antioxidation activity of 5-substituted 6-methyluracils was quantitatively estimated in the model system of initiated
radical-chain oxidation of 1,4-dioxane. The rate constants of the reactions of 1,4-dioxane peroxide radicals with 6-methyluracil
(1), 6-methyl-5-piperidinouracil (2), 6-methyl-5-morpholinomethyluracil (3), 6-methyl-5-morpholinouracil (4), 6-methyl-5-methylaminouracil
(5), 5-ethylamino-6-methyluracil (6), and 5-hydroxy-6-methyluracil (7) were measured. Among compounds 1–7, derivative 7 is
most efficient with an inhibition rate constant of (5.2±0.1) · 104 L mol-1 s-1 (60 °C). |
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