ABSTRACT
RO2 . þArOH ! ROOHþArO.: (7)
Several experimental evidences of this mechanism were obtained. The rate of chain oxidation of
a substrate (RH) was proved to be proportional to [ArOH]1 (see Chapter 14) [1-6]. The phenoxyl radicalswere identifiedby theEPRmethodas intermediateproductsof the reaction [6]
Phenols decrease the intensity of CL Ichl in oxidized hydrocarbons as a result of chain
termination by the reaction with peroxyl radicals. Since Ichl ~ [RO2 . ]2 (see Chapter 2), the
ratio (I0/I) 1/2 was found to be proportional to [ArOH] [7]. The kinetic isotope effect (kOH/kOD
1) proves that the peroxyl radical abstracts a hydrogen atom from the OH bond of phenol [2,8].
