A kinetic study of the self-reaction of prop-2-ylperoxyl radicals in solution using ultraviolet absorption spectroscopy

Abstract

Overall rate constants for the self-reaction of prop-2-ylperoxyl radicals in the liquid phase (cyclohexane, decane and dodecane) have been measured over the temperature range 293-373 K using ultraviolet absorption spectroscopy to monitor the concentration of alkylperoxyl radicals. The Arrhenius constants for the self-reaction are Et = 20 f 3 kJ mol-l and 2A, = (5 f 2.5) x lo9 dm3 mol-l s-l. Above 363 K there is evidence that reaction with the solvent becomes increasingly important.

Chemistry of Reactive Oxygen Species

“…As the temperature is raised, a disproportionation reaction becomes more important. For example, for the 2-propylperoxyl radical (Bennett, 1987;Bennett et al, 1987a,b):…”