A versatile cobalt catalyst for the reductive amination of carbonyl compounds with nitro compounds by transfer hydrogenation

Cobalt Entrapped in N,S‐Codoped Porous Carbon: Catalysts for Transfer Hydrogenation with Formic Acid

“…Recently, transition‐metal‐based N‐doped carbon catalysts (M–N–C, M=Co, Fe, Ni) have received worldwide attention, because they exhibit similar properties to those of noble metal catalysts and can promote number of organic reactions . Subsequently, several efficient M–N–C catalysts have been developed for active and selective hydrogenation of functionalized of nitroarenes with FA . It has been proven that N‐doped carbon shells play a vital role in promoting the catalytic activity and selectivity of these catalysts through a synergistic effect with cobalt nanoparticles (NPs) .…”

Synthesis of Cobalt-Based Nanomaterials from Organic Precursors

“…Additionally, with increasing calcination temperature, the diffraction peaks for cobalt/ cobalt oxide became sharper in contrast to those for carbon, indicating that the crystallinity of cobalt-based nanoparticles increased and graphite content decreased due to its partial oxidation [47]. According to SEM and TEM micrographs, cobalt-based nanoparticles were spherical, coated with carbon and dispersed in the carbon matrix [54], uniformly distributed on carbon layered structures with particle size of 5-30 nm [53], supported on carbon with random size distribution in the range from 1 to 32 nm [50], embedded in carbon with average particle size of 8-10 nm [51] and encapsulated within carbon nanotubes with an average particle size of 50 nm [52]. N 2 adsorption-desorption isotherms of the as-synthesized nanocomposites exhibited the type IV isotherm with a H3-type hysteresis loop, demonstrating the mesoporous nature of the materials, while the textural properties of the materials varied widely (S BET = 76-365 m and the average pore size varied from 4.8 to 6.9 nm depending on the calcination temperature [51].…”

“…Gingasu et al synthesized cobalt chromite catalysts via thermal decomposition of tartrate and gluconate precursors and reported that gluconate-derived CoCr 2 O 4 was the best catalyst for total oxidation of methane exhibiting high activity and CO 2 selectivity [41]. Co nanoparticles embedded in mesoporous nitrogen-doped carbon were investigated by Zhou et al for the reductive amination of carbonyl compounds with nitro compounds by transfer hydrogenation with formic acid and found them to be active and selective with excellent yields for secondary amines [51]. Another reported application of cobalt-based nanoparticles is in water treatment for the removal of dye pollutants.…”

“…According to SEM and TEM micrographs, cobalt-based nanoparticles were spherical, coated with carbon and dispersed in the carbon matrix [54], uniformly distributed on carbon layered structures with particle size of 5-30 nm [53], supported on carbon with random size distribution in the range from 1 to 32 nm [50], embedded in carbon with average particle size of 8-10 nm [51] and encapsulated within carbon nanotubes with an average particle size of 50 nm [52]. N 2 adsorption-desorption isotherms of the as-synthesized nanocomposites exhibited the type IV isotherm with a H3-type hysteresis loop, demonstrating the mesoporous nature of the materials, while the textural properties of the materials varied widely (S BET = 76-365 m and the average pore size varied from 4.8 to 6.9 nm depending on the calcination temperature [51]. In many publications, electrical and magnetic properties have been investigated due to the potential use of the as-synthesized materials in Li-ion batteries and as electrocatalysts [47,[52][53][54].…”

Transfer Hydrogenation of Nitroarenes Catalyzed by CoCu Anchored on Nitrogen‐doped Porous Carbon

“…Based on the XPS data, atomic information of C, Co, Cu, and N can be obtained. The three peaks centered at 289.0 285.5 and 284.6 eV were attributed to C − N bonds, sp 3 ‐hybridized diamond‐like carbon and sp 2 ‐hybridized graphite‐like carbon, respectively (Figure a) . The signal of Co and Cu were weak, probably because CoCu were covered by carbon shell.…”