Kinetic and Mechanism of Oxidation of Benzazolylformamidines by Permanganate in Alkaline Medium
American Journal of Applied Chemistry
Volume 4, Issue 2, April 2016, Pages: 50-58
Received: Feb. 21, 2016;
Accepted: Mar. 6, 2016;
Published: Mar. 19, 2016
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Ahmed Fawzy, Chemistry Department, Faculty of Applied Science, Umm Al-Qura University, Makkah, Saudi Arabia; Chemistry Department, Faculty of Science, Assiut University, Assiut, Egypt
Ishaq Zaafarany, Chemistry Department, Faculty of Applied Science, Umm Al-Qura University, Makkah, Saudi Arabia
Ismail Althagafi, Chemistry Department, Faculty of Applied Science, Umm Al-Qura University, Makkah, Saudi Arabia
Ameena Al-Bonayan, Chemistry Department, Faculty of Applied Science, Umm Al-Qura University, Makkah, Saudi Arabia
Faten Aljiffrey, Chemistry Department, Faculty of Applied Science, Umm Al-Qura University, Makkah, Saudi Arabia
In alkaline medium, the kinetics of oxidation of two substituted benzazolylformamidines, namely N, N-dimethyl-N’-(1H-benzimidazol-2-yl) formamidine (BIF) and N, N-dimethyl-N’-(benzthiazol-2-yl) formamidine (BTF) by permanganate ion has been studied spectrophotometrically at a constant ionic strength of 0.1 mol dm-3 and at 25°C. The reactions exhibited first order kinetics with respect to [permanganate]. Fractional-first order dependences of both reactions on [reductants] and [alkali] were revealed. Increasing either ionic strength or solvent polarity of the medium had no significant effect on the rates. The final oxidation products of BIF and BTF were identified as 2-aminobenzimidazole and 2-aminobenzthiazole, respectively, in addition to dimethylamine and carbon dioxide. Under comparable experimental conditions, the oxidation rate of BIF was higher than that of BTF. The reaction mechanism adequately describing the kinetic results was proposed, and the reaction constants involved in the different steps of the mechanism have been evaluated. The activation parameters with respect to the rate-limiting step of the reactions, along with thermodynamic quantities were computed and discussed.
Kinetic and Mechanism of Oxidation of Benzazolylformamidines by Permanganate in Alkaline Medium, American Journal of Applied Chemistry.
Vol. 4, No. 2,
2016, pp. 50-58.
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