Immobilization of platinum nanoparticles on the functionalized chitosan particles: an efficient catalyst for reduction of nitro compounds and tandem reductive Ugi reactions.

Abstract

In this work, we reported a facile synthesis of Pt nanoparticles (NPs) on proline-functionalized cross-linked chitosan particles to catalyze the reduction of R-NO2 to R-NH2 in aqueous medium using sodium borohydride. Chitosan was functionalized with (3-bromopropyl)proline and cross-linked with glutaraldehyde for the synthesis of chitosan NPs. The platinum NPs was prepared on the chitosan NPs. This catalyst showed the good selectivity and activity for reduction of nitro compound as well as for tandem reduction of nitro groups in Ugi reaction.