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Substituted pyrazine-di-N-oxides as the mediators of catalytic oxidation of organic compounds

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Abstract

The mechanism of oxidation of 2,5-dimethyl-, 2,3,5,6-tetramethyl-, 2,3-dimethyl-5,6-cyclohexa, and 3-phenyl-5,6-cyclohexapyrazine-di-N-oxides is studied by cyclic voltammetry, quantum chemical simulations, and ESR electrolysis. The studies are carried out on electrodes of glassy carbon and Pt in 0.1 M LiClO4 solutions in acetonitrile. ESR spectra of radical cations of substituted pyrazine-di-N-oxides are recorded. The effects of the temperature, oxygen, and the additions of water, pyridine, and acid on the shape of cyclic voltamograms and the intensity of ESR signals of pyrazine-di-N-oxides are studied. A quantum-chemical simulation of the reaction of pyrazine-di-N-oxide radical cations with acetonitrile is carried out. The oxidation of substituted pyrazine-di-N-oxides is described by the E1C1E2C2 mechanism, which includes the stage of the formation of a complex between the di-N-oxide radical cation and acetonitrile.

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Authors and Affiliations

  1. Institute of Problems of Chemical Physics Russian Academy of Sciences, Moscovskaya oblast’, Chernogolovka, 142432, Russia

    S. I. Kulakovskaya, A. V. Kulikov & A. F. Shestakov

Authors
  1. S. I. Kulakovskaya
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  2. A. V. Kulikov
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  3. A. F. Shestakov
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Correspondence to S. I. Kulakovskaya.

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Original Russian Text © S.I. Kulakovskaya, A.V. Kulikov, A.F. Shestakov, 2007, published in Elektrokhimiya, 2007, Vol. 43, No. 10, pp. 1220–1227.

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Kulakovskaya, S.I., Kulikov, A.V. & Shestakov, A.F. Substituted pyrazine-di-N-oxides as the mediators of catalytic oxidation of organic compounds. Russ J Electrochem 43, 1156–1163 (2007). https://doi.org/10.1134/S1023193507100084

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  • DOI: https://doi.org/10.1134/S1023193507100084

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