Oxidative carbonylation of amine using water-soluble palladium catalysts in biphasic media

TitleOxidative carbonylation of amine using water-soluble palladium catalysts in biphasic media
Publication TypeJournal Article
Year of Publication2011
AuthorsDidgikar, MR, Joshi, SS, Gupte, SP, Diwakar, MM, Deshpande, RMadhukar, Chaudhari, RV
JournalJournal of Molecular Catalysis A-Chemical
Date PublishedJAN
KeywordsAmine, Biphasic catalysis, Carbonylation, Urea, Water-soluble palladium catalyst

Application of water-soluble palladium catalysts for oxidative carbonylation of aniline to N,N' diphenyl urea (DPU) has been reported. The water-soluble palladium catalysts prepared from sulfonated N-containing ligands were found to be highly stable under reaction conditions and easily recyclable due to insoluble urea product in the reaction medium. This is in contrast to the sulfonated phosphine ligands, which are vulnerable to oxidation under reaction conditions, showing poor activity and stability. Commercially available as well as laboratory synthesized ligands were used for preparing water-soluble palladium catalysts, for oxidative carbonylation of aniline. The best activity was obtained for Pd complex with disodium 2,2'-bipyridine-4,4'-disulfonate (Bipy-DS) ligand. Under optimized conditions Pd(BipyDS)Pd(OAc)(2) catalyst gave TOF of similar to 210h(-1) with aniline conversion of similar to 97% with similar to 91% selectivity for N.N'-diphenyl urea. It was found that the catalyst was easily reusable up to five times, with negligible loss in the catalytic activity. The effect of reaction parameters was investigated and a plausible reaction mechanism has been proposed. (C) 2010 Elsevier B.V. All rights reserved.

Type of Journal (Indian or Foreign)Foreign
Impact Factor (IF)3.17
Divison category: 
Chemical Engineering & Process Development