In these comments, a substantiated conclusion was made that the additive calculation scheme proposed by E. T. Denisov and T. G. Denisova for the enthalpies of formation, Delta H-f(0)(g), of alpha-hydroxyhydroperoxides (15 compounds) is erroneous, since the well-known interaction in the systems when two O atoms are located on the same carbon atom was ignored. As a consequence, the cited authors overestimated the values of for molecules by similar to 30 kJ mol(-1) and more. Using some examples, we present another empirical scheme of calculation of Delta H-f(0) for such systems, which gives more accurate results. Since the formation enthalpies for the starting molecules calculated by the authors of the article in question were used further in the calculation of the kinetic and thermodynamic parameters of alpha-hydroxyperoxyl radicals, the values of these parameters and for these free radicals are incorrect.