Synthesis of methyl N - phenyl carbamate catalyzed by ionic liquid - promoted zinc acetate / Xinqiang Zhao in Industrial & engineering chemistry research, Vol. 51 N° 35 (Septembre 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - pp. 11335-11340 Titre : Synthesis of methyl N - phenyl carbamate catalyzed by ionic liquid - promoted zinc acetate Type de document : texte imprimé Auteurs : Xinqiang Zhao, Auteur ; Lijuan Kang, Auteur ; Na Wang, Auteur Année de publication : 2012 Article en page(s) : pp. 11335-11340 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Ionic liquid Catalytic reaction Résumé : A series of ionic liquid-promoted zinc acetate catalysts (Zn(OAc)2-ILs) were prepared by separately mixing anhydrous zinc acetate with one of some ionic liquids, and their catalytic performance for the synthesis of methyl N-phenyl carbamate (MPC) from aniline and dimethyl carbonate (DMC) was evaluated. Among the catalysts, Zn(OAc)2-[bmim]PF6 showed the best catalytic performance. Under the suitable reaction conditions, aniline conversion and MPC selectivity were 99.8% and 99.1%, respectively. Moreover, Zn(OAc)2-[bmim]PF6 could be used five times without a significant loss in its catalytic performance. The mechanism for the promotion of ionic liquid [bmim]PF6 on the catalytic performance of zinc acetate was investigated by means of FT-IR analysis. The results show that a hydrogen bond is formed between the carbonyl oxygen of zinc acetate and the C2-H on an imidazoiume ring of [bmim]PF6. As a result, the zinc acetate changes from a bidentate to a unidentate coordination structure. Simultaneously, this change promotes the coordination of the carbonyl oxygen in a DMC molecule with the zinc atom in the zinc acetate molecule, faciliting the attack of the nitrogen atom in an aniline molecule on the carbonyl carbon in the coordinated DMC molecule and then the formation of MPC. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26324781 [article] Synthesis of methyl N - phenyl carbamate catalyzed by ionic liquid - promoted zinc acetate [texte imprimé] / Xinqiang Zhao, Auteur ; Lijuan Kang, Auteur ; Na Wang, Auteur . - 2012 . - pp. 11335-11340. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 35 (Septembre 2012) . - pp. 11335-11340 Mots-clés : Ionic liquid Catalytic reaction Résumé : A series of ionic liquid-promoted zinc acetate catalysts (Zn(OAc)2-ILs) were prepared by separately mixing anhydrous zinc acetate with one of some ionic liquids, and their catalytic performance for the synthesis of methyl N-phenyl carbamate (MPC) from aniline and dimethyl carbonate (DMC) was evaluated. Among the catalysts, Zn(OAc)2-[bmim]PF6 showed the best catalytic performance. Under the suitable reaction conditions, aniline conversion and MPC selectivity were 99.8% and 99.1%, respectively. Moreover, Zn(OAc)2-[bmim]PF6 could be used five times without a significant loss in its catalytic performance. The mechanism for the promotion of ionic liquid [bmim]PF6 on the catalytic performance of zinc acetate was investigated by means of FT-IR analysis. The results show that a hydrogen bond is formed between the carbonyl oxygen of zinc acetate and the C2-H on an imidazoiume ring of [bmim]PF6. As a result, the zinc acetate changes from a bidentate to a unidentate coordination structure. Simultaneously, this change promotes the coordination of the carbonyl oxygen in a DMC molecule with the zinc atom in the zinc acetate molecule, faciliting the attack of the nitrogen atom in an aniline molecule on the carbonyl carbon in the coordinated DMC molecule and then the formation of MPC. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26324781

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