Accueil
Résultat de la recherche
2 résultat(s) recherche sur le tag ''dodécyle'
Ajouter le résultat dans votre panier Affiner la recherche Générer le flux rss de la recherche
Partager le résultat de cette recherche
Kinetics and mechanism of nucleophilic xubstitution in SnR2Cl2 × 2DMSO by chloride ions in micellar microenvironment / Abdul Moheman in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 49, N° 4 (07-08/2012)
[article]
Titre : Kinetics and mechanism of nucleophilic xubstitution in SnR2Cl2 × 2DMSO by chloride ions in micellar microenvironment Type de document : texte imprimé Auteurs : Abdul Moheman, Auteur ; Seema Yadav, Auteur ; Khwaja Salahuddin Siddiqi, Auteur Année de publication : 2012 Article en page(s) : p. 287 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Surfactants Tags : Surfactants 'Substitution nucléophilique' Solvatation' 'Dodécyle sulfate sodium' Micelles Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : The kinetics of nucleophilic substitution of dimethylsulfoxide by chloride ion in bis-dimethyl sulfoxide dimethyltin(IV) dichloride and bis-dimethyl sulfoxide diphenyltin(IV) dichloride in micellar microenvironment (1.0 × 10–2M SDS in aqueous solution of ethanol (1:1, v/v) has been studied conductometrically. The reactions have been carried out at 25 °C. Substitution follows first order path with respect to chloride ion concentration. A millimolar solution of the complexes in ethanolic solution of 1.0 × 10–2M SDS shows an increase in conductance with time due to solvation of the molecule. Sn(CH3)2Cl2× 2 DMSO shows high conductance as compared to Sn(C6H5)2Cl2× 2 DMSO. In the presence of the nucleophilic reagents, C6H5COCl and CH3COCl there is a greater enhancement in conductance due to substitution of DMSO by chloride ion. The data of rate constant for solvation (KS) and for nucleophilic substitution (K1and K2) have been calculated. It was found that the solvation is a slower process compared to the substitution by chloride ions i. e., K1, K2> Ks. A possible mechanism has been suggested. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15546
in TENSIDE, SURFACTANTS, DETERGENTS > Vol. 49, N° 4 (07-08/2012) . - p. 287[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 14042 - Périodique Bibliothèque principale Documentaires Disponible Micellar catalysis on pentavalent vanadium ion oxidation of ethanol in aqueous acide media / Sumanta K. Ghosh in TENSIDE, SURFACTANTS, DETERGENTS, Vol. 49, N° 4 (07-08/2012)
[article]
Titre : Micellar catalysis on pentavalent vanadium ion oxidation of ethanol in aqueous acide media Type de document : texte imprimé Auteurs : Sumanta K. Ghosh, Auteur ; Aniruddha Ghosh, Auteur ; Saha Rumpa, Auteur ; Kakali Mukherjee, Auteur ; Ankita Basu, Auteur ; Bidyut Saha, Auteur Année de publication : 2012 Article en page(s) : p. 296-299 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Surfactants Tags : Cinétique Vanadium Ethanol 'Dodécyle sulphate sodium' 'Chlorure N-cetylpyridinium' 'Surfactant anionique' neutre 'Triton X-100' Catalyse Micelles Index. décimale : 668.1 Agents tensioactifs : savons, détergents Résumé : Vanadium(V) oxidation of ethanol follows a first order dependency on the concentration of ethanol, vanadium(V), H+and HSO4 –. These observations remain unaltered in the presence of externally added surfactants. The effect of the cationic surfactant (i.e., N-cetylpyridinium chloride [CPC]), anionic surfactant (i.e., sodium dodecyl sulphate [SDS]) and neutral surfactant (i.e., Triton X-100 [TX-100]) has been studied. CPC inhibits the reactions, whereas SDS and TX-100 accelerate the reaction to different extents. Observed effects have been justified by considering the hydrophobic and electrostatic interaction between the surfactants and reactants. SDS and TX-100 can be used as catalysts in the production of acetaldehyde from ethanol. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15548
in TENSIDE, SURFACTANTS, DETERGENTS > Vol. 49, N° 4 (07-08/2012) . - p. 296-299[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 14042 - Périodique Bibliothèque principale Documentaires Disponible