Journal
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
Volume 227, Issue 1-2, Pages 197-207Publisher
ELSEVIER
DOI: 10.1016/j.molcata.2004.10.024
Keywords
PAMAM palladium dendrimer cyclocarbonylation reaction; silica-immobilized catalysts
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Palladium complexes immobilized onto generations 0-3 PAMAM dendrimers supported on silica, in the presence of 1.4-bis(diphenylphosphino)butane. were used as catalysts for the cyclocarbonylation of 2-allylphenols, 2-allylaniline, 2-vinylphenol and 2-vinylaniline affording five-, six- or seven membered ring lactones and lactams. Good conversions were realized using the catalytic system, and the catalyst was recycled 3-5 times. The influence of the spacer chain was investigated, as well as the solvent and the CO/H-2 ratio, on the selectivity and the recyclability of the cyclocarbonylation reactions. (C) 2004 Elsevier B.V. All rights reserved.
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