Ionic liquid as catalyst for solid-Liquid Phase transfer catalyzed synthesis of p-Nitrodiphenyl ether / Ganapati D. Yadav in Industrial & engineering chemistry research, Vol. 47 N° 23 (Décembre 2008)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9081–9089 Titre : Ionic liquid as catalyst for solid-Liquid Phase transfer catalyzed synthesis of p-Nitrodiphenyl ether Type de document : texte imprimé Auteurs : Ganapati D. Yadav, Auteur ; Bhavana G. Motirale, Auteur Année de publication : 2009 Article en page(s) : p. 9081–9089 Note générale : Chemistry engineering Langues : Anglais (eng) Mots-clés : Synthesis of p-Nitrodiphenyl Ethe Résumé : The novelties of solid−liquid phase transfer catalyzed synthesis of p-nitrodiphenyl ether from p-nitrochlorobenzene and potassium phenoxide were studied in detail with ionic liquids as phase transfer catalysts among others. Tetradecyl(trihexyl)phosphonium bromide was found to be the best catalyst leading to 100% selectivity toward the desired product p-nitrodiphenyl ether. Ionic liquids offer excellent conversions and selectivity, stability at high temperatures, and reusability in this reaction. A mathematical model was developed to study the kinetics of the reaction and used to extract both the rate constant and ion-exchange equilibrium constant. The contribution of the uncatalyzed reaction was also considered in this model. The activation energy and Gibb’s free energy for a combined ion exchange were also calculated. Microwave irradiation was also employed as an effective alternative to conventional heating. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800340j [article] Ionic liquid as catalyst for solid-Liquid Phase transfer catalyzed synthesis of p-Nitrodiphenyl ether [texte imprimé] / Ganapati D. Yadav, Auteur ; Bhavana G. Motirale, Auteur . - 2009 . - p. 9081–9089. Chemistry engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9081–9089 Mots-clés : Synthesis of p-Nitrodiphenyl Ethe Résumé : The novelties of solid−liquid phase transfer catalyzed synthesis of p-nitrodiphenyl ether from p-nitrochlorobenzene and potassium phenoxide were studied in detail with ionic liquids as phase transfer catalysts among others. Tetradecyl(trihexyl)phosphonium bromide was found to be the best catalyst leading to 100% selectivity toward the desired product p-nitrodiphenyl ether. Ionic liquids offer excellent conversions and selectivity, stability at high temperatures, and reusability in this reaction. A mathematical model was developed to study the kinetics of the reaction and used to extract both the rate constant and ion-exchange equilibrium constant. The contribution of the uncatalyzed reaction was also considered in this model. The activation energy and Gibb’s free energy for a combined ion exchange were also calculated. Microwave irradiation was also employed as an effective alternative to conventional heating. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800340j

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Novelties of solid-Liquid phase transfer catalyzed synthesis of triclosan from potassium 2,4-Dichlorophenolate and 2,5-Dichlorophenol / Ganapati D. Yadav in Industrial & engineering chemistry research, Vol. 47 N° 23 (Décembre 2008)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9055–9060 Titre : Novelties of solid-Liquid phase transfer catalyzed synthesis of triclosan from potassium 2,4-Dichlorophenolate and 2,5-Dichlorophenol Type de document : texte imprimé Auteurs : Ganapati D. Yadav, Auteur ; Bhavana G. Motirale, Auteur Année de publication : 2009 Article en page(s) : p. 9055–9060 Note générale : Chemistry engineering Langues : Anglais (eng) Mots-clés : Solid−  Liquid Phase Catalyzed Synthesis of Triclosan from Potassium Résumé : Triclosan is a broad-spectrum bacteriostat and an antimicrobial agent popularly used in hygiene and health care products. The current paper presents a cost-effective and simpler process of synthesis of triclosan from 2,5-dichlorophenol and potassium 2,4-dichlorophenolate by using p-xylene as a solvent under solid−liquid phase transfer catalysis (S−L PTC), at 120 °C. It leads to 100% selectivity of the product in comparison with a liquid−liquid PTC process. A novel mathematical model is developed to determine simultaneously the rate constant and anion exchange equilibrium constant from the same set of data. This will be helpful in reactor design and scale-up. The activation energy and Gibbs free energy for a combined ion exchange and partitioning of ion pairs are calculated. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800191k [article] Novelties of solid-Liquid phase transfer catalyzed synthesis of triclosan from potassium 2,4-Dichlorophenolate and 2,5-Dichlorophenol [texte imprimé] / Ganapati D. Yadav, Auteur ; Bhavana G. Motirale, Auteur . - 2009 . - p. 9055–9060. Chemistry engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N° 23 (Décembre 2008) . - p. 9055–9060 Mots-clés : Solid−  Liquid Phase Catalyzed Synthesis of Triclosan from Potassium Résumé : Triclosan is a broad-spectrum bacteriostat and an antimicrobial agent popularly used in hygiene and health care products. The current paper presents a cost-effective and simpler process of synthesis of triclosan from 2,5-dichlorophenol and potassium 2,4-dichlorophenolate by using p-xylene as a solvent under solid−liquid phase transfer catalysis (S−L PTC), at 120 °C. It leads to 100% selectivity of the product in comparison with a liquid−liquid PTC process. A novel mathematical model is developed to determine simultaneously the rate constant and anion exchange equilibrium constant from the same set of data. This will be helpful in reactor design and scale-up. The activation energy and Gibbs free energy for a combined ion exchange and partitioning of ion pairs are calculated. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800191k

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