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SO3H-functionalized ionic liquids for selective alkylation of p-cresol with tert-butanol / Xiumei Liu in Industrial & engineering chemistry research, Vol. 47 n°15 (Août 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°15 (Août 2008) . - p. 5298–5303 Titre : SO3H-functionalized ionic liquids for selective alkylation of p-cresol with tert-butanol Type de document : texte imprimé Auteurs : Xiumei Liu, Auteur ; Jinxia Zhou, Auteur ; Xinwen Guo, Auteur ; Liu, Min, Auteur Année de publication : 2008 Article en page(s) : p. 5298–5303 Note générale : Bibliogr. p. 5303 Langues : Anglais (eng) Mots-clés : SO3H  --  ionic  liquids;  Hammett  method;  p-cresol  conversion;  tert-Butanol Résumé : The SO3H-functionalized ionic liquids were synthesized by using pyridine and 1,4-butane or 1,3-propane sulfone as the source and characterized by NMR and time-of-flight mass spectrometry. The acidity of the ionic liquids determined by the Hammett method is almost the same as that of a conventional acid, such as H2SO4. The catalytic performance of ionic liquids for the tert-butylation of p-cresol with tert-butanol was evaluated; by using the ionic liquids as catalysts at the optimum reaction conditions, 79% of the p-cresol conversion and 92% of the selectivity to 2-tert-butyl-p-cresol can be obtained. The spent ionic liquid can be recovered and recycled. The possible mechanism for this reaction system was discussed based on the reaction results and the ab initio calculation results. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie070647t [article] SO3H-functionalized ionic liquids for selective alkylation of p-cresol with tert-butanol [texte imprimé] / Xiumei Liu, Auteur ; Jinxia Zhou, Auteur ; Xinwen Guo, Auteur ; Liu, Min, Auteur . - 2008 . - p. 5298–5303. Bibliogr. p. 5303 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°15 (Août 2008) . - p. 5298–5303 Mots-clés : SO3H  --  ionic  liquids;  Hammett  method;  p-cresol  conversion;  tert-Butanol Résumé : The SO3H-functionalized ionic liquids were synthesized by using pyridine and 1,4-butane or 1,3-propane sulfone as the source and characterized by NMR and time-of-flight mass spectrometry. The acidity of the ionic liquids determined by the Hammett method is almost the same as that of a conventional acid, such as H2SO4. The catalytic performance of ionic liquids for the tert-butylation of p-cresol with tert-butanol was evaluated; by using the ionic liquids as catalysts at the optimum reaction conditions, 79% of the p-cresol conversion and 92% of the selectivity to 2-tert-butyl-p-cresol can be obtained. The spent ionic liquid can be recovered and recycled. The possible mechanism for this reaction system was discussed based on the reaction results and the ab initio calculation results. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie070647t