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[en] Highlights: • High barrier of 2.3 V for iodine oxidation is related with reaction induction period. • Despite of the oxidation barrier, 95.4% conversion of iodine to iodate is confirmed. • Existence of the specific energy redistribution is assumed as oxidation initiator. We investigated the degree of isothermal iodine conversion to iodate as one of the most intriguing steps of the Bray-Liebhafsky oscillator. The amount of the produced iodate, in the presence of hydrogen peroxide, was determined by the stopped-flow titration with iodide ions. From five different experiments, high degree of iodine conversion to iodate (95.4 ± 0.6)% is obtained. It confirmed that, after the induction period of spontaneous hydrogen peroxide catalytic decomposition, reaction dynamics is dominated by thermodynamically demanding oxidative processes. Isothermal change of the reaction dynamics introduces some specific energy redistribution as a possible initiator of oxidizing radicals.