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Pd(II) Catalyzed oxidative degradation of paracetamol by chloramine-T in acidic and alkaline media / Ajaya Kumar Singh in Industrial & engineering chemistry research, Vol. 50 N° 14 (Juillet 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 14 (Juillet 2011) . - pp. 8407-8419 Titre : Pd(II) Catalyzed oxidative degradation of paracetamol by chloramine-T in acidic and alkaline media Type de document : texte imprimé Auteurs : Ajaya Kumar Singh, Auteur ; Reena Negi, Auteur Année de publication : 2011 Article en page(s) : pp. 8407-8419 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Chemical  degradation  Oxidation  Oxidative  degradation  Catalytic  reaction Résumé : Pd(II) catalyzed oxidation of paracetamol (PA) by sodium N-chloro p-toluenesulfonamide (chloramine-T or CAT) was studied in HClO4 and NaOH solutions at 303 K. The stoichiometry and the oxidation product in both solutions were found to be the same. The determined stoichiometric ratio was 1:2 ([PA]:[CAT]) and quinone oxime was identified as the oxidized product of PA. However, the kinetics patterns in both media were different. In the acidic medium, the rate law was ―d[CAT]/dt = k[CAT][PA]0.9[Pd(II)]0.8[H+]―0.4 and the rate law was ―d[CAT]/dt = k[CAT][PA]0.9[Pd(II)] [PTS]―0.4[NaOH]―1, in the alkaline medium. p-Toluenesulphonamide (PTS) is the reduced product of CAT. The kinetics of the reaction was studied as a function of temperature, ionic strength, concentration of the salt, concentration of the added reaction product, and dielectric constant of the medium to learn the mechanistic aspects of the reaction. A plausible mechanism is proposed, which is consistent with the kinetics, stoichiometry, and product of the reaction. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24346881 [article] Pd(II) Catalyzed oxidative degradation of paracetamol by chloramine-T in acidic and alkaline media [texte imprimé] / Ajaya Kumar Singh, Auteur ; Reena Negi, Auteur . - 2011 . - pp. 8407-8419. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 14 (Juillet 2011) . - pp. 8407-8419 Mots-clés : Chemical  degradation  Oxidation  Oxidative  degradation  Catalytic  reaction Résumé : Pd(II) catalyzed oxidation of paracetamol (PA) by sodium N-chloro p-toluenesulfonamide (chloramine-T or CAT) was studied in HClO4 and NaOH solutions at 303 K. The stoichiometry and the oxidation product in both solutions were found to be the same. The determined stoichiometric ratio was 1:2 ([PA]:[CAT]) and quinone oxime was identified as the oxidized product of PA. However, the kinetics patterns in both media were different. In the acidic medium, the rate law was ―d[CAT]/dt = k[CAT][PA]0.9[Pd(II)]0.8[H+]―0.4 and the rate law was ―d[CAT]/dt = k[CAT][PA]0.9[Pd(II)] [PTS]―0.4[NaOH]―1, in the alkaline medium. p-Toluenesulphonamide (PTS) is the reduced product of CAT. The kinetics of the reaction was studied as a function of temperature, ionic strength, concentration of the salt, concentration of the added reaction product, and dielectric constant of the medium to learn the mechanistic aspects of the reaction. A plausible mechanism is proposed, which is consistent with the kinetics, stoichiometry, and product of the reaction. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24346881