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- W2001261029 abstract "The electrochemical oxidation of 2,4,6-tribromoaniline in aqueous sulphuric acid solutions, at different concentrations, and in aqueous 60% perchloric acid solution, at a platinum electrode, has been studied by rotating disc electrode and cyclic voltammetry. An irreversible first oxidation process, controlled by diffusion is observed, in perchloric acid and in sulphuric acid concentration <12.5 M. At higher sulphuric acid concentration, this process is kinetically controlled. The electroactive species is the protonated form Ar−N+H3, which is bielectronically oxidized to [Ar−NH3]3+ cation. Deprotonation of this cation can produce two different species, Ar−N2+ H2 (I) and Ar+−N+H3 (II). In the latter case (II), the deprotonation occurs from the benzene ring. Hydrolysis of (I) gives 3,5-dibromo-1,2,4-trihydroxybenzene, which is further oxidized to 3,5-dibromo-2-hydroxy-2,5-cyclohexadien-1,4-dione. This charge-transfer equilibrium explains an additional redox pair observed for the first process in cyclic voltammograms. An irreversible second oxidation process corresponding to an initial bielectronic oxidation of (II), in both sulphuric acid at concentration >9.0 M and perchloric acid solutions, is observed. Generally, this second process is kinetically controlled. The rate-determining step of both processes is attributed to the initial charge transfer for the electrode reaction under diffusion control or to an adsorption process, depending on the medium used." @default.
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- W2001261029 date "1984-01-01" @default.
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- W2001261029 title "Voltammetric study of the oxidation kinetics of 2,4,6,-tribromoaniline in acid medium" @default.
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- W2001261029 doi "https://doi.org/10.1016/s0022-0728(84)80124-2" @default.
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