[en] The reactions of peroxy radicals produced from 2-propanol and from methanol were investigated. At pH3 the peroxy radicals were found to decay by both second- and first-order processes: O₂CH₂OH → HO₂ + CH₂O, k approximately equal to 5 x 10²s^-1; O₂COH(CH₃)₂ → HO₂ + (CH₃)₂CO, k = (700 +- 150)s^-1; 2O₂CH₂OH → products, 2k = (3 +- 1) x 10⁸ M^-1 s^-1; 2O₂COH(CH₃)₂ → products, 2k = (1.1 +- 0.2) x 10⁷ M-¹ s^-1. The reactivity of O₂C(OH) (CH₃)₂ toward OH^- and HPO₄^2- ions, resulting in the ionization of the peroxy radicals, and the subsequent formation of O₂^-, was studied. A rate constant k/sub ((CH₃)₂C(OH)(O₂)+OH^-→(CH₃)₂C(O^-)(O₂)+H₂O)/ = (5.2 +- 1) x 10⁹ M^-1 s^-1 was measured. The similar reaction with HPO₄^2- was found to have a rate constant of (1.07 +- 0.15) x 10⁷ M^-1 s^-1. All results were reported for an ionic strength of 0.1 M