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Uncatalyzed chemical oscillations in the aqueous acidic bromate oxidation of veratraldehyde

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Abstract

Oscillatory behavior in the uncatalyzed aqueous acidic bromate oxidation of 3,4-dimethoxybenzaldehyde (veratraldehyde) is reported. The generally used H2SO4 can be substituted by HNO3, HClO4, CCl3 COOH and H3PO4 in this system. The length of the induction period is found to be dependent on the initial concentrations of the reagents and this effect is more prominent in the case of acidity. The precipitate accumulated in the reaction during oscillations has been identified. A plausible mechanism is also suggested. Experiments with allyl alcohol, a bromine scavenger, suggest that elemental bromine formed in the reaction has a role in the mechanism together with or besides bromide inons.

Abstract

Описывается осциллирующее поведение некатализированного окисления 3,4-диметоксибензальдегида (вератральдегида) водным кислым броматом. Обычно используемая H2SO4 может быть заменена HNO3, HClO4, CCl3 COOH и H3PO4 в этих системах. Длительность индукционного периода зависит от начальной концентрации реагентов и этот эффект особенно явен в случае кислотности. Осадок, накапливающийся в реакции во время осцилляций, был идентифицирован. Предлагается вероятный механизм. Эксперименты с аллиловым спиртом, ловушкой брома, приводят к тому заключению, что элементарный бром, образуюшийся в реакции, также играет роль в механизме вместе или крпме бромидных ионов.

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References

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Authors and Affiliations

  1. University, 456-010, Ujjain, India

    P. K. R. Nair, A. Mittal, S. V. Kadamne & K. Srinivasulu

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  1. P. K. R. Nair
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  2. A. Mittal
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  3. S. V. Kadamne
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  4. K. Srinivasulu
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Nair, P.K.R., Mittal, A., Kadamne, S.V. et al. Uncatalyzed chemical oscillations in the aqueous acidic bromate oxidation of veratraldehyde. React Kinet Catal Lett 19, 201–205 (1982). https://doi.org/10.1007/BF02065085

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  • DOI: https://doi.org/10.1007/BF02065085

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