The autoxidation of aromatic hydrocarbons catalyzed with cobaltic acetate in acetic acid solution I. The oxidation of toluene
1972; Elsevier BV; Volume: 25; Issue: 3 Linguagem: Inglês
10.1016/0021-9517(72)90234-5
ISSN1090-2694
Autores Tópico(s)Catalysis and Oxidation Reactions
ResumoThe kinetics of the oxidation of toluene catalyzed by cobaltic acetate in acetic acid have been studied at 60 °C. The oxidation proceeds without induction period, and the maximum absoiption rate of oxygen as well as the maximum reduction rate of cobaltic ion were observed at the beginning of the reaction. Eoth maximum rates can be expressed as follows, −dO2dt = k[φ-CH3][Co(III)]2[Co(II)]−1−dCo(III)dt = k′[φ-CH3][Co(III)]2[Co(II)]−1 with k′k ~ 1.7. The oxidation product was exclusively benzaldehyde at the early stage of oxidation. The following mechanisms are proposed: (1) The oxidation of toluene to benzyl radical proceeds by the reaction of toluene with a dimer of cobaltic ion; (2) Benzylperoxy radical is oxidized to benzaldehyde by a cobaltic ion.
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