Journal :   Asian Journal of Research in Chemistry

Volume No. :   5

Issue No. :  6

Year :  2012

Pages :   753-758

ISSN Print :  0974-4169

ISSN Online :  0974-4150


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Kinetics and Mechanism of Oxidation of Some  - Hydroxy Acids by Pyridinium Dichromate in Aqueous Acetic Acid Medium



Address:   S. Zaheer Ahmed1, S. Syed Shafi2, S. Sheik Mansoor3
1Department of Chemistry, Islamiah College, Vaniyambadi – 635 752, Tamil Nadu, India.
2Department of Chemistry, Thiruvalluvar University, Serkadu, Vellore – 632 106, Tamil Nadu, India.
3Department of Chemistry, C. Abdul Hakeem College, Melvisharam – 632 509, Tamil Nadu, India.
*Corresponding Author
DOI No:

ABSTRACT:
The Kinetics and mechanism of oxidation of some ? hydroxy acids by pyridinium dichromate (PDC) has been studied by spectrophotometric method in 50% acetic acid - 50% water (v/v) medium at 303K. Under the conditions of pseudo first order, the reaction follows first order kinetics with respect to hydroxy acid, [H+] and [PDC]. The reaction is catalysed by perchloric acid. There is no salt effect. The rate increases with increase in the percentage of acetic acid and the plot of log Kobs Versus 1/D is linear with a positive slope indicating the ion-dipole nature of the reaction. Activation parameters have been evaluated. Based on the experimental results, a suitable mechanism has been proposed.
KEYWORDS:
Pyridinium dichromate, hydroxy acids, kinetics, oxidation, perchloric acid.
Cite:
S. Zaheer Ahmed, S. Syed Shafi, S. Sheik Mansoor. Kinetics and Mechanism of Oxidation of Some  - Hydroxy Acids by Pyridinium Dichromate in Aqueous Acetic Acid Medium. Asian J. Research Chem. 5(6): June, 2012; Page 753-758.
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