ABSTRACT
Aromatic amines terminate chains in oxidizing hydrocarbons with the stoichiometric coeffi-
cient between 1 and 2 as a result of the consecutive reactions (see Chapter 15).
RO2 . þAmH ! ROOHþAm.
Am . þRO2. ! Products
Am . þAm. ! Products
High values of the inhibition coefficient ( f¼ 12-28) were detected for the first time in the oxidation of cyclohexanol [1] and butanol [2] inhibited by 1-naphthylamine. For the oxida-
tion of decane under the same conditions, f¼ 2.5. In the case of oxidation of the decanecyclohexanol mixtures, the coefficient f increases with an increase in the cyclohexanol
concentration from 2.5 (in pure decane) to 28 (in pure alcohol). When the oxidation of
cyclohexanol was carried out in the presence of tetraphenylhydrazine, the diphenylaminyl
radicals produced from tetraphenylhydrazine were found to be reduced to diphenylamine [3].
This conclusion has been confirmed later in another study [4]. Diphenylamine was formed
only in the presence of the initiator, regardless of whether the process was conducted under an
oxygen atmosphere or under an inert atmosphere. In the former case, the aminyl radical was
reduced by the hydroperoxyl radical derived from the alcohol (see Chapter 6), and in the
latter case, it was reduced by the hydroxyalkyl radical.
