Reactions of nitrogen dioxide with antioxidants: Estimation of the activation energies and rate constants

The activation energies and preexponential factors of hydrogen-atom abstraction from the O-H bonds of phenols and hydroxylamines, the N-H bonds of amines, and the S-H bonds of thiophenols (a total of 147 compounds) by nitrogen dioxide were calculated in terms of the parabolic model of radical abstraction reactions. The calculations were performed with due regard to the dependence of the preexponential factor on the reaction enthalpy. The rates of the reactions of NO2 with hydrocarbons and antioxidants are compared. The rates of these reactions in some systems are found to be comparable.