Abstract
Highly sensitive microvolumometry at 323 K is used in combination with kinetic modeling to measure the rate constants (k4) and kinetic coefficients of inhibition (fkin) of the reaction of 1,4-substituted butadiene oxidation by hydroperoxyl radicals (\({\text{HO}}_{2}^{ \bullet }\)) in the presence of antioxidants (InH): 1,4-hydroquinone and 1,4-benzoquinone. The cyclic mechanism of interaction between \({\text{HO}}_{2}^{ \bullet }\) and InH is confirmed: it leads to multiple chain termination, as is demonstrated by the observed long-term inhibition of the oxidation of substrates by hydroquinone and benzoquinone, and the obtained fkin > 102. It is shown that the drop in the value of k4 upon replacing –C6H5 substituent at the double bond in 1,4-substituted butadiene with –COOCH3 is due to the influence of specific solvation.
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This work was supported by the Russian Science Foundation, grant no. 20-13-00148.
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Translated by V. Selikhanovich
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Chepeleva, A.D., Grobov, A.M., Sirik, A.V. et al. Antioxidant Activity of Hydroquinone in the Oxidation of 1,4-Substituted Butadiene. Russ. J. Phys. Chem. 95, 1077–1079 (2021). https://doi.org/10.1134/S0036024421050071
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DOI: https://doi.org/10.1134/S0036024421050071