Base-free chemoselective transfer hydrogenation of nitroarenes to anilines with formic acid as hydrogen source by a reusable heterogeneous Pd/ZrP catalyst

Preparation of Well‐Ordered Mesoporous‐Silica‐Supported Ruthenium Nanoparticles for Highly Selective Reduction of Functionalized Nitroarenes through Transfer Hydrogenation

“…The effects of the hydrogen donor, solvent, and substrate concentration were investigated in detail to optimize the reaction conditions, and the results are summarized in Table 2 (entries 17-33). Initially, we explored the reduction of 4-methoxynitrobenzene in the presence of 0.5Ru/ OMS-IL with five different hydrogen donors: hydrazine hydrate, sodium borohydride, formic acid, potassium formate, and hydrogen ( Table 2, entries [17][18][19][20][21]. The use of hydrazine hydrate ( Table 2, entry 1) in ethanol as the solvent resulted in the highest conversion of 4-methoxynitrobenzene (69 %) with >99 % selectivity to 4-methoxyaniline.…”

“…Nitroarenes with nonreducible groups such as -CH 3 , -OH, -NH 2 , and -CF 3 ( Table 3, entries 1-9), were quantitatively transformed into the corresponding amines in yields >99 %. Furthermore, we were pleased to find that halo (F, Cl, Br)-substituted nitroarenes could be reduced to the corresponding anilines with no discernible dehalogenation ( Table 3, entries [10][11][12][13][14][15][16][17][18][19][20]. A number of other reducible functional groups (e.g., carboxy, ester, nitrile, amide, and sulfanilamide) were tolerated in the reduction reaction ( Table 3, entries [21][22][23][24].…”

“…However, the homogeneous catalytic process is generally unaccepted as a preferential alternative, as recovery and reuse of the expensive metals are difficult and most of the reactions do not proceed without the use of expensive ligands. Heterogeneous catalysts (noble metal catalysts such as Au,, , Pd, Pt,, and Ru, , ) have many advantages over their homogeneous counterparts, including easy removal from reaction mixtures and recyclability. Ru catalysts, especially those supported on high‐surface‐area heterogeneous catalyst supports, are recognized as promising catalysts for the catalytic hydrogenation of nitro compounds because of their high catalytic activity and low cost , , .…”

Mesoporous silica supported Pd/Ag bimetallic nanoparticles as a plasmonic catalyst for chemoselective hydrogenation of p-nitrostyrene under visible light irradiation

“…The chemoselective reduction of nitro to amino group in the presence of reducible groups like C=C bond is still a challenge to be achieved. [28][29][30][31] The catalytic activity of Ag and Pd/Ag NPs was evaluated in the chemoselective hydrogenation of p-nitrostyrene to p-aminostyrene using AB (hydrogen source) as a reducing agent as shown in Scheme 1. AB is a white colored solid at room temperature which contains 19.6 wt.% of hydrogen and has attracted great attention to be used as a promising storage material in the recent past.…”

Hydrothermal Preparation of a Robust Boehmite‐Supported N,N‐Dimethyldodecylamine N‐Oxide‐Capped Cobalt and Palladium Catalyst for the Facile Utilization of Formic Acid as a Hydrogen Source

“…These results motivated us to extend the preparation method for a bimetallic catalyst such as CoPd and to examine its catalytic activity for the industrially important maleic anhydride (MAn) hydrogenation reaction toward succinic acid (SA), a C‐4 building block chemical 42. Very recently, our group synthesized supported metal catalysts for efficient utilization of FA in the hydrogenation reactions of 5‐hydroxymethylfuraldehyde, levulinic acid, and nitroarenes 43–45. Continuous research efforts in the effective and facile utilization of FA under moderate conditions with decreased metal content for industrially important catalytic reactions paved the path for this research.…”