Polyamidoamine dendrimers, constructed on the surface of silica, were phosphonated by using diphenylphosphinomethanol, prepared in situ, and complexed to rhodium by use of [Rh(CO) 2 Cl] 2 . Excellent selectivities, favoring the branched aldehydes obtained from aryl olefins and vinyl esters, were observed by using the Rh(I) complex as the catalyst in hydroformylation reactions. The heterogeneous Rh (I) catalyst can also be recycled and reused without significant loss of selectivity or activity.
Polyamidoamine dendrimers, constructed on the surface of silica, were phosphonated using diphenylphosphinomethanol (prepared in situ) and complexed to form a palladium-dimethyl TMEDA complex. This catalyst was found to be effective in the Heck reaction of aryl bromides with both butyl acrylate and styrene, affording coupling products in moderate to good yields. The heterogeneous palladium catalyst can also be recycled and reused with only moderate reduction in activity.Key words: dendrimer, Heck, palladium, silica.Résumé : Utilisant du diphénylphosphinométhanol (préparé in situ), on a réalisé la phosphonation de dendrimères de polyamidoamines synthétisés sur une surface de silice et en a fait un complexe de palladium-« TMEDA » de diméthyle. On a trouvé que ce catalyseur est efficace dans la réaction de Heck des bromures d'aryles avec aussi bien l'acrylate de butyle que le styrène et que ces réactions fournissent des produits de couplage avec des rendements allant de modérés à bons. On peut aussi régénérer le catalyseur hétérogène et le réutiliser avec une perte mineure d'activité.
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