Journal :   Asian Journal of Research in Chemistry

Volume No. :   5

Issue No. :  7

Year :  2012

Pages :   906-911

ISSN Print :  0974-4169

ISSN Online :  0974-4150


Registration

Allready Registrered
Click to Login

Ruthenium (III) Catalyzed Oxidation of Calcium Dobesilate Monohydrate by Chloramine-B in Alkaline Medium. A Kinetic and Mechanistic Approach



Address:   Diwya1, R. Ramachandrappa2, Pushpa Iyengar1*
1East Point College of Engineering and Technology, Bidarahalli, Virgo Nagar Post Bangalore-560049, Karnataka, India.
2Department of Chemistry, Jyoti Nivas College, Koramangala Industrial Layout, Bangalore - 560095, Karnataka, India.
*Corresponding Author
DOI No:

ABSTRACT:
Kinetics and oxidation of Calcium Dobesilate(CDM) (calcium 2,5-dihydroxybenzenesulfonate) by sodium – N- chlorobenzene sulphonamide(Chloramine-B or CAB) using Ru(III) catalyst in NaOH medium has been studied at 303K. Oxidation reaction follows kinetics of first order with [CAB], positive first order dependence on [CDM], positive fractional order slope with [NaOH] and [RuCl3]. Effect of halide ions and added benzene sulphonamide has negligible effect on the rate of reaction. Variation in ionic strength has no effect on the rate of the reaction indicating that non-ionic species are involved in the rate limiting step. Positive effect of Dielectric constant was observed. Kinetic parameters were evaluated by studying the reaction at different temperatures. Addition of reaction mixture to aqueous acrylonitrile did not initiate polymerization showing the absence of free radical species. Oxidation products were identified. PhSO2NCl— of CAB, the reactive species which combines with the substrate to give product in presence of catalyst. Based on kinetic results, reaction stoichiometry and oxidation products, a suitable mechanism have been proposed.
KEYWORDS:
Calcium Dobesilate monohydrate, Oxidation, mechanism, Chloramine - B, kinetics.
Cite:
Diwya, R. Ramachandrappa, Pushpa Iyengar. Ruthenium (III) Catalyzed Oxidation of Calcium Dobesilate Monohydrate by Chloramine-B in Alkaline Medium. A Kinetic and Mechanistic Approach. Asian J. Research Chem. 5(7): July, 2012; Page 906-911.
[View HTML]      [View PDF]



Visitor's No. :   106953