Hydrogenation of nitroarenes using polybenzimidazole-supported rhodium catalyst

Abstract

Polybenzimidazole (PBI)-supported rhodium PBI-Rh(I) catalyst was prepared and characterised by chemical analysis, IR, TGA and X-ray photoelectron spectroscopy. Sodium borohydride was used to produce active species of the catalyst. The anchored catalyst PBI-Rh(I) was found to be effective for the reduction of nitrophenols, nitrobenzoic acids and nitroanilines in methanol at room temperature and at 1 atm hydrogen. The influence of temperature, concentrations of the catalyst and substrate and nature of the solvent on the reaction rates was investigated. The recycling efficiency of the catalyst was found to be good. A probable mechanism for the catalytic reaction has been suggested.

Preparation of Copper Nanoparticles and Catalytic Properties for the Reduction of Aromatic Nitro Compounds

“…1 In general, the amino aryl compounds can be obtained by the reduction of the nitro aryl compounds. There are several approaches to realize the reduction process: metal/acid reduction, 2,3 catalytic hydrogenation, 4-6 electrolytic reduction, 7 homogeneous catalytic transfer hydrogenation, 8 heterogeneous catalytic transfer hydrogenation, 9-13 etc. However, these methods have certain shortcomings:…”

Hydrogenation of substituted nitroarenes by a polymer-bound palladium(II) Schiff base catalyst

“…Due to the importance of polymer-supported complexes, we have used various polymer supports for the hydrogenation of olefins, nitro compounds and Schiff bases [13][14][15]. In continuation of this work, we describe in this article an efficient and mild method for the reduction of aromatic nitro compounds using a palladium Schiff base complex anchored to polystyrene cross-linked with divinylbenzene (DVB) as catalyst.…”

Synthesis, structure and catalytic activity of the supported Ni catalysts for highly efficient one-step hydrogenation of 1,5-dinitronaphthalene to 1,5-diaminodecahydronaphthalene

“…The developed heterogeneous catalysts mainly include the supported precious metal (Pt, Pd, Ru and alloys) catalysts [3][4][5][6], or non-noble metal (raney Ni and amorphous alloy) catalysts [7,8], in which the supports are oxides, polymers or activated carbon. So far, many catalytic hydrogenation reactions have been conducted in gas phase [9][10][11] or liquid phase [12][13][14][15], which involve the use of heterogeneous transition metal catalysts, such as Pd [16], Pt [17], Rh [18], Ir [19], Ni [20][21][22], raney Ni [23], Au [24], Ru [25] or poly-metallic catalysts [26,27]. However, most of the catalysts are still expensive.…”