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Kinetics and salt effects in the oxidation of pentanones by thallium(III) salts in aqueous medium

M. Pechál, Š. Holotík, M. Strašák, and M. Hrušovský

Shoe and Leather Research Institute, CS-762 65 Gottwaldov

Abstract: The kinetics of oxidn. of pentanones by thallium(III) salts in aq. medium was investigated by UV spectrophotometry at concns. of 10^-4-10^-2 mol dm^-3 and iodometrically at concns. of about 3×10^-1 mol dm^-3. In the first case, the influence of concn. of inert electrolyte and ratio x(SO₄^2-)/x(ClO₄^-) on the rate of reaction was also studied. The rate of oxidn. of 3-pentanone did not depend on ionic strength and increased exponentially with decreasing ratio x(SO₄^2-)/x(ClO₄^-) at const. ionic strength. In the second case, influence of concn. of Li₂SO₄ and NaClO₄ on the selectivity of reaction was studied at higher concns. of reactants. The ratio of mole fractions of both main reaction products of oxidn. of 2-pentanone, i.e. 3-hydroxy-2-pentanone and 1-hydroxy-2-pentanone, increased with concn. of Li₂SO₄ and decreased with increasing concn. of NaClO₄.

Full paper in Portable Document Format: 372a159.pdf

Chemical Papers 37 (2) 159–167 (1983)