Rezumat articol ediţie STUDIA UNIVERSITATIS BABEŞ-BOLYAI

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The kinetics of phenol oxidation by permanganate has been carried out in relative strong acidic media, in the presence and in absence of manganese (II) as catalyst. Formation of an intermediate colored species that absorbs light at 400 nm has been observed during the course of reaction. Its formation and decay has been followed spectrophotometrically. The intermediate has been assigned as 4,4’-biphenoquinone. Kinetic laws for the formation and consumption of this intermediate have been established. Complicate rate equations of the one-plus form were deduced either for building up or for decomposition of the intermediate. Rate constants, pre-equilibrium constants and experimental activation energies were determined. Some mechanistic considerations were made.

Keywords: phenol, permanganate, kinetics, 4,4’-biphenoquinone.