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Kinetics of Oxidation of Vitamin-B3 (Niacin) by Sodium N-bromo benzenesulphonamide (Bromamine-B) in HCl Medium and Catalysis by Ru(III) ion

Author Affiliations

  • 1Department of Chemistry, Yuvaraj’s college, University of Mysore, Mysore -570005, INDIA
  • 2Department of studies in Chemistry, Manasagangothri, University of Mysore, Mysore, INDIA

Res.J.chem.sci., Volume 2, Issue (8), Pages 26-30, August,18 (2012)

Abstract

Kinetics of uncatalyzed and Ru(III) catalyzed oxidation of vitamin-B3 (niacin) by the titled compound (bromamine-B) in HCl medium has been studied at 303K. The uncatalyzed reaction shows a first order dependence of the rate on (BAB) and (vitamin-B3), inverse fractional order in (acid). The Ru(III) Catalyzed reaction on the other hand shows a first order behavior on each of (BAB) and (vitaminB3), fractional order dependence on Ru(III) and inverse fractional order in (acid). The reaction rate shows inverse fractional order (benzenesulphonamide) in both uncatalyzed and Ru(III) ion catalyzed reactions. Addition of halide ions, variation of ionic strength and dielectric constant of the medium had no effect on the reaction rate. Activation parameters have been evaluated from the arrhenius plots, mechanisms consistent with the above kinetic data have been proposed.

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