Effect of cetyltrimethylammonium bromide on the oxidation of béta-alanine by N-bromophthalimide in acidic medium / Y. R. Katre in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 45, N° 4/2008 (07-08/2008)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 45, N° 4/2008 (07-08/2008) . - p. 213-221 Titre : Effect of cetyltrimethylammonium bromide on the oxidation of béta-alanine by N-bromophthalimide in acidic medium Type de document : texte imprimé Auteurs : Y. R. Katre, Auteur ; G. K. Joshi, Auteur ; A. K. Singh, Auteur Année de publication : 2008 Article en page(s) : p. 213-221 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Kinetics  Oxidation  B-alanine  Binding  constant  Index  cooperativity Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : The kinetics of the oxidation of béta-alanine (Ala) by N-bromophthalimide (NBP) has been studied in the presence of cationic surfactant, cetyltrimethylammonium bromide (CTAB) at 313 K. The oxidation kinetics exhibits first order kinetics with respect to [Oxidant], fractional order of [Ala] and inverse fractional order of [H+] on the rate of reaction. The rate of reaction decreases with decreasing dielectric constant of the medium. The rate constant increases with increasing CTAB and then constant. Increasing [Hg(OAc)2] and inorganic salts i.e. [Cl–] and [Br–] increased the rate of reaction, whereas a change in ionic strength of the medium had no effect on oxidation velocity. Methyl Cyanide as the main oxidation product has been identified. Thermodynamic and activation parameters have been evaluated. The rate constants, binding constants with surfactant (CTAB) and the index of cooperativity have also been evaluated. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2947 [article]

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Kinetic and mechanistic study of the influence of micelles on the oxidation of acetone by N-bromophthalimide in aqueous acetic acid medium / Y. R. Katre in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 46, N° 4/2009 (07-8/2009)

[article]  inTENSIDE, SURFACTANTS, DETERGENTS > Vol. 46, N° 4/2009 (07-8/2009) . - p. 218-227 Titre : Kinetic and mechanistic study of the influence of micelles on the oxidation of acetone by N-bromophthalimide in aqueous acetic acid medium Type de document : texte imprimé Auteurs : Y. R. Katre, Auteur ; K. Tripathi, Auteur ; G. K. Joshi, Auteur ; A. K. Singh, Auteur Année de publication : 2009 Article en page(s) : p. 218-227 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Surfactants Tags : N-bromophthalimide  Cetyltrimethylammonium  bromide  Sodium  dodecyl  sulphate  Acetone  Oxidation  Kinetics Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : The effect of cationic micelles of Cetyltrimethylammonium bromide (CTAB) and anionic micelles of Sodium dodecyl Sulphate (SDS) on the kinetics of oxidation of acetone by N-Bromophthalimide (NBP) was studied iodometrically at 308 K. In addition to kinetic experiments, conductivity measurements have also been done to obtain critical micelle concentration and other thermodynamic properties. The kinetic observations indicate fractional order and first order dependence, with respect to [Acetone] and [NBP] respectively. Cationic surfactant (CTAB) strongly catalysed the oxidation of acetone in aqueous acetic acid medium and typical kobs and [CTAB] profile was observed i.e. with the progressive increase in [CTAB], the reaction rate increased, at higher concentration constancy in kobs was observed, whereas anionic surfactant (SDS) was found to show no considerable effect on reaction rate. Mercuric acetate and phthalimide exhibited nil effect on the reaction rate. The presence of inorganic salts (KCl, KBr) exhibits positive effect in the reaction rate. The various activation parameters in presence of CTAB and SDS have been also evaluated. A suitable mechanism consistent with the experimental findings has been proposed. The binding constant with surfactants has been evaluated. DOI : 10.3139/113.110027 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=6055 [article]

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