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    Vol 1(1), 2014
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  • Know Res., 2014, 1(1),  pp 33-39  

    DOI:10.7598/kor2014.109

    Research Article

    Oxidation of myo-Inositol by Alkaline Permanganate and the Effect of Alkali Metal ion Catalysts: Kinetic and Mechanistic Approach

  • G. T. Nayak1, C. C. Hadimani1 and A. L. Harihar2
  • 1Chemistry Department, B.V.Bhoomaraddi College of Engineering and Technology, Hubli, Karnataka, India
    2Chemistry Department, Kittel Science College, Dharwad, Karnataka, India
  • Abstract

    The kinetics of oxidation of myo-inositol (INOS) by alkaline permanganate at a constant ionic strength of 0.1 mol/dm3 was studied spectrophotometrically. The reaction between permanganate and INOS in aqueous alkaline medium exhibits 2:1stoichiometry. The reaction is of first order in [MnO4-] and less than unit order with respect to both [INOS] and [alkali]. The pH influence indicated that the oxidation is base catalyzed. The reaction rate was found to increase with increase with increasing ionic strength and dielectric constant of the medium. The proposed reaction mechanism involves the formation of a 1:1 intermediate complex between INOS and an alkali-permanganate species in a pre-equilibrium step, which was confirmed by both spectral and kinetic evidence. The complex decomposes slowly in a rate determining step, resulting in the generation of free radical. The free radical generated reacts again with another alkali-permanganate species in a subsequent fast step to yield the final reaction products which were identified by spot test and spectral studies. The reaction constants involved in the different steps of the reaction mechanism were calculated. The activation parameters with respect to the slow step of the mechanism were determined.

    Keywords

    Permanganate, myo-inositol, Oxidation, Kine

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