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Zinc acetates as efficient catalysts for the synthesis of bis - isocyanate precursors / Elisenda Reixach in Industrial & engineering chemistry research, Vol. 49 N° 14 (Juillet 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 14 (Juillet 2010) . - pp. 6362-6366 Titre : Zinc acetates as efficient catalysts for the synthesis of bis - isocyanate precursors Type de document : texte imprimé Auteurs : Elisenda Reixach, Auteur ; Nuria Bonet, Auteur ; F. Xavier Rius-Ruiz, Auteur Année de publication : 2010 Article en page(s) : pp. 6362-6366 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Precursor  Catalyst Résumé : Anhydrous and hydrated zinc acetates were found to efficiently catalyze alkoxycarbonylation of the aromatic diamines 2,4-toluenediamine (2,4-TDA) and 4,4'-diphenylmethane diamine (4,4'-MDA) with diethyl and dimethyl carbonate, providing the desired bis-carbamates in yields from 93 to 98%. Driving these reactions to completion required temperatures of ca. 190 °C for 2,4-TDA and ca. 180 °C for 4,4'-MDA, and alkyl carbonate-to-substrate molar ratios of 25 :1 to 30:1. Higher catalyst loadings were required for 2,4-TDA (2.5 mol %) than for 4,4'-MDA (I mol %). ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23040390 [article] Zinc acetates as efficient catalysts for the synthesis of bis - isocyanate precursors [texte imprimé] / Elisenda Reixach, Auteur ; Nuria Bonet, Auteur ; F. Xavier Rius-Ruiz, Auteur . - 2010 . - pp. 6362-6366. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 14 (Juillet 2010) . - pp. 6362-6366 Mots-clés : Precursor  Catalyst Résumé : Anhydrous and hydrated zinc acetates were found to efficiently catalyze alkoxycarbonylation of the aromatic diamines 2,4-toluenediamine (2,4-TDA) and 4,4'-diphenylmethane diamine (4,4'-MDA) with diethyl and dimethyl carbonate, providing the desired bis-carbamates in yields from 93 to 98%. Driving these reactions to completion required temperatures of ca. 190 °C for 2,4-TDA and ca. 180 °C for 4,4'-MDA, and alkyl carbonate-to-substrate molar ratios of 25 :1 to 30:1. Higher catalyst loadings were required for 2,4-TDA (2.5 mol %) than for 4,4'-MDA (I mol %). ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23040390