Documents disponibles écrits par cet auteur

Catalysis and mechanistic studies of Ru(III), Os(VIII), Pd(II), and Pt(IV) metal ions on oxidative conversion of folic acid / Kumar, C. H. Vinod in Industrial & engineering chemistry research, Vol. 49 N° 4 (Fevrier 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 4 (Fevrier 2010) . - pp 1550–1560 Titre : Catalysis and mechanistic studies of Ru(III), Os(VIII), Pd(II), and Pt(IV) metal ions on oxidative conversion of folic acid Type de document : texte imprimé Auteurs : Kumar, C. H. Vinod, Auteur ; Jagadeesh, R. V., Auteur ; Shivananda, K. N., Auteur Année de publication : 2010 Article en page(s) : pp 1550–1560 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Homogeneous  catalysis  Metal  Ions  Folic  Acid. Résumé : The homogeneous catalysis of Ru(III), Os(VIII), Pd(II), and Pt(IV) in the oxidative conversion of folic acid (FA) to pterin-6-carboxylic acid, p-aminobenzoic acid, and glutamic acid by sodium N-bromo-p-toluenesulfonamide (bromamine-T; BAT) was studied in alkaline medium. The detailed kinetic and mechanistic investigations of all four catalyzed oxidation reactions were studied at 313 K. The stoichiometries and oxidation products of the four catalyzed reactions were found to be the same, but their kinetic patterns and oxidation mechanisms were different. The reactions were studied at different temperatures, and the activation parameters were evaluated for each catalyzed reaction. Under identical sets of experimental conditions, the kinetics of all four catalyzed reactions were compared with those of uncatalyzed reactions, revealing that the catalyzed reactions are 6−22 times faster. The catalytic efficiency of these catalysts follows the order Os(VIII) > Ru(III) > Pt(IV) > Pd(II). This trend can be attributed to the different d electronic configuration of the catalysts. Based on the observed experimental results, a detailed mechanistic interpretation and the related kinetic model were derived for each catalyst. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900340k [article] Catalysis and mechanistic studies of Ru(III), Os(VIII), Pd(II), and Pt(IV) metal ions on oxidative conversion of folic acid [texte imprimé] / Kumar, C. H. Vinod, Auteur ; Jagadeesh, R. V., Auteur ; Shivananda, K. N., Auteur . - 2010 . - pp 1550–1560. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 4 (Fevrier 2010) . - pp 1550–1560 Mots-clés : Homogeneous  catalysis  Metal  Ions  Folic  Acid. Résumé : The homogeneous catalysis of Ru(III), Os(VIII), Pd(II), and Pt(IV) in the oxidative conversion of folic acid (FA) to pterin-6-carboxylic acid, p-aminobenzoic acid, and glutamic acid by sodium N-bromo-p-toluenesulfonamide (bromamine-T; BAT) was studied in alkaline medium. The detailed kinetic and mechanistic investigations of all four catalyzed oxidation reactions were studied at 313 K. The stoichiometries and oxidation products of the four catalyzed reactions were found to be the same, but their kinetic patterns and oxidation mechanisms were different. The reactions were studied at different temperatures, and the activation parameters were evaluated for each catalyzed reaction. Under identical sets of experimental conditions, the kinetics of all four catalyzed reactions were compared with those of uncatalyzed reactions, revealing that the catalyzed reactions are 6−22 times faster. The catalytic efficiency of these catalysts follows the order Os(VIII) > Ru(III) > Pt(IV) > Pd(II). This trend can be attributed to the different d electronic configuration of the catalysts. Based on the observed experimental results, a detailed mechanistic interpretation and the related kinetic model were derived for each catalyst. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900340k