POLYMER-SUPPORTED PALLADIUM AND RHODIUM SPECIES AS HYDROGENATION CATALYSTS

The synthesis of new copolymers containing amino and heterocyclic liga nds and their use for anchoring Pd and Rh species is described. The su pported catalysts are effective for the hydrogenation of alkenes, dien es, alkynes, and nitrobenzene under very mild conditions. The catalyst s have been characterized by chemical analysis, particle size measurem ent, IR, and x-ray photoelectron spectroscopy. Relative reactivities a nd the effects of substrate structure, solvents, catalyst loading, anc horing ligands, metal species, and particle size on the rates of hydro genation have been determined using a wide variety of substrates. The kinetics of hydrogenation have been analyzed using concepts suitable u nder slurry reaction conditions. Comparisons between different oxidati on states of the same metal and between different metal species have a lso been made. The recycling efficiencies of the catalysts have been d etermined and found to be very good. (C) 1997 John Wiley & Sons, Inc.