Hg (II) Catalysed Oxidation of D-Arabinose and D-Mannose by Acidic Solution of Potassium Permanganate: Kinetics and Mechanism

R. Naz

Department of Chemistry, University of Karachi, 75270, Karachi, Pakistan

R. Azmat

Department of Chemistry, University of Karachi, 75270, Karachi, Pakistan

N. Qamar

Department of Chemistry, Jinnah University for Women, 74600 Karachi, Pakistan

N.I. Siddiqi

HEJ Research Institute, University of Karachi, Karachi, Pakistan

Received
25 Aug, 2014

Accepted
15 Sep, 2014

Published
20 Sep, 2014

ABSTRACT:

The kinetics of Hg (II) catalyzed oxidation of D-Arabinose (Ara) and D-Mannose (Man) by potassium permanganate in acidic medium have been studied spectrophotometrically in the temperature range 30-50oC. The reactions exhibit first order kinetics with respect to [Man] and [MnO₄] while second order with [Ara]. The reaction rates were found to be unaffected by the change in [H⁺ ]. It has been observed that Hg (II) catalyzed the reaction but as the [Hg(II)] increases, reaction rate becomes independent. Negligible effect of ionic strength (μ) on the rate of oxidation has also been noted which supports the presence of at least one neutral specie in the rate determining step. The rate of oxidation was influenced by the change in temperature. Various activation parameters have been calculated. Formic acid and erythronic acid were identified as main oxidation product in case of arabinose while for mannose formic acid and arabinonic acid were identified. A mechanism consistent with the above findings has also been proposed.

How to Cite this paper?

APA-7 Style
Naz, R., Azmat, R., Qamar, N., Siddiqi, N.I. (2014). Hg (II) Catalysed Oxidation of D-Arabinose and D-Mannose by Acidic Solution of Potassium Permanganate: Kinetics and Mechanism. Pakistan Journal of Chemistry, 4(3), 116-123. https://doi.org/10.15228/2014.v04.i03.p04

ACS Style
Naz, R.; Azmat, R.; Qamar, N.; Siddiqi, N.I. Hg (II) Catalysed Oxidation of D-Arabinose and D-Mannose by Acidic Solution of Potassium Permanganate: Kinetics and Mechanism. Pak. J. Chem. 2014, 4, 116-123. https://doi.org/10.15228/2014.v04.i03.p04

AMA Style
Naz R, Azmat R, Qamar N, Siddiqi NI. Hg (II) Catalysed Oxidation of D-Arabinose and D-Mannose by Acidic Solution of Potassium Permanganate: Kinetics and Mechanism. Pakistan Journal of Chemistry. 2014; 4(3): 116-123. https://doi.org/10.15228/2014.v04.i03.p04

Chicago/Turabian Style
Naz, R., R. Azmat, N. Qamar, and N. I. Siddiqi. 2014. “Hg (II) Catalysed Oxidation of D-Arabinose and D-Mannose by Acidic Solution of Potassium Permanganate: Kinetics and Mechanism” Pakistan Journal of Chemistry 4, no. 3: 116-123. https://doi.org/10.15228/2014.v04.i03.p04

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