Abstract
Kinetics of oxidation of 2-propanone, 2-butanone, and 2-pentanone by chloramine-B (CAB) in presence of NaOH and OsO4 catalyst has been investigated at 303 K. The reaction rate shows a first–order dependence each on [CAB]o and [Os(VIII)], fractional-order on [NaOH], and zero-order on [ketone]o. The solvent isotope effect k/(H2O) / k/(D2O) = 0.58. Activation parameters have been deduced. An isokinetic relation is obtained with β = 340 K. The rate of oxidation of ketones follows the order: 2-pentanone > 2-butanone > 2-propanone. The Os(VIII) catalyzed reactions are 7 to 9 fold faster than the uncatalyzed reactions. Suitable mechanism and rate law have been proposed.
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