Design and preparation of a simple and effective palladium catalyst and the hydrogenation performance toward dibenzylbiotinmethylester

A series of well-dispersed carbon supported Pd catalysts were prepared by a simple and effective method under mild conditions. The functionalized carbon supported Pd catalyst (Pd/AC-H) demonstrated a enhanced performance to original carbon supported Pd catalyst (Pd/AC) in the probe reaction hydrogenation of 3,4-(1',3'-Dibenzy1-2'-oxoimidazolido)-2-(4-carboxybutylidene)thiophane to dibenzylbiotinmethylester. The results of various characterization techniques revealed that the improvement of Pd dispersion on Pd/AC-H catalyst surface could be associated to the presence of abundant oxygen containing groups available for anchorage. Furthermore, the role of the surface groups of carbon supports was indispensable since they could provide an efficient pathway for the reaction. The oxygen-containing groups located at the Pd-supports interface were able to adjust the strength of reactant adsorption/activation on the Pd active sites, which was responsible for the high yield of dibenzylbiotinmethylester. (C) 2016 Elsevier Inc. All rights reserved.