Kinetics and mechanism of OsO4 catalyzed oxidation of chalcones by Ce4 in aqueous acetic sulfuric acid media

Kinetic study of the ruthenium(VI)‐catalyzed oxidation of benzyl alcohol by alkaline hexacyanoferrate(III)

“…1). The plots of 1/v 0 vs 1/[Fe(CN) 6 3− ] gave straight lines with positive slopes and intercepts. Hence, the variation of the initial rate as a function of hexacyanoferrate(III) concentration is given by the equation…”

“…For each series we varied [benzyl alcohol] while maintaining constant [OH − ] and [RuO 4 2− ] ( Fig. 2) so as to determine the rate equation that combines the dependence of v 0 on both [Fe(CN) 6 3 Table I). The plot of b 1 vs 1/[Fe(CN) 6 3− ] was linear: r = 0.9955, slope = k = (1 ± 0.1) × 10 2 s, and 6 3− ] also gave a linear correlation: r = 0.9890, slope = k = 0.25 ± 0.02 M s, and intercept = k = (8.4 ± 0.4) × 10 2 s. Hence, the dependence of v 0 on both [Fe(CN) 6 3− ] and [benzyl alcohol] …”

“…The initial rates were obtained by fitting the absorbance/time data, for a small percentage of the reaction (5% or less) [20], to a straight line A = a 0 + a 1 t, by the least-squares method; the slope provides the initial rate, v 0 = α 1 = −(dA/dt) 0 , given in absorbance units. The initial rate v 0 expressed in M s −1 is given by 6 3− ]/dt) 0 , where ε = 1000 M −1 cm −1 at 420 nm.…”

“…We carried out five series of kinetic experiments at different [Fe(CN) 6 3− ]. For each series we varied [benzyl alcohol] while maintaining constant [OH − ] and [RuO 4 2− ] ( Fig.…”

“…We obtained the stoichiometry of the reaction spectrophotometrically by measuring, at 420 nm, the residual oxidant concentration under the following conditions: [Fe(CN) 6 3− ] …”