Collection of Czechoslovak Chemical Communications - digital archive 

Abstract

Oxidation of 2,4-pentanedione with Ce(IV) ions in a solution of sulphuric acid is an inner-sphere reaction which proceeds via an intermediary complex. The reaction is of the first order with respect to both reactants, it is catalysed with H₃O⁺ ions, and its rate diminishes with increasing concentrations of HSO₄^- and Ce(III) ions. According to the proposed mechanism, the rate-determining reaction step is an intramolecular redox step of the intermediary complex. The modified Belousov-Zhabotinskii reaction with 2,4-pentanedione as substrate is interesting in that oscillations with an increasing amplitude are formed after an induction period even in the absence of stirring.