Chemoselective flow hydrogenation of α,β – Unsaturated aldehyde with nano-nickel

On‐the‐fly Catalyst Modification: Strategy to Improve Catalytic Processes Selectivity and Understanding

“…Their base catalyst selectively saturated double and triple carbon bonds but also C=O over a wide range of substrates (Table ). We have demonstrated that Hudson's approach could be extended to other metals (e. g. Pd, Ni, Cu, Ag and Ru) and oxide supports (e. g. micrometric alumina) . The target hydrogenations were α,β ‐unsaturated aldehydes and ketones, nitrophenol and D‐xylose, demonstrating the approach's versatility.…”

Porous, Naturally Derived Hafnium Phytate for the Highly Chemoselective Transfer Hydrogenation of Aldehydes with Other Reducible Moieties

“…To date, direct hydrogenation with the use of H 2 as the reductant and catalytic transfer hydrogenation (CTH) with secondary alcohols are two routes that are commonly used for the reduction of aldehydes with ORMs, and great efforts have been devoted to exploring efficient and selective catalytic systems. In general, supported transition metals (e.g., Ru, Pd, Au, Pt, Cu, Co, Ir, and Ni) and metal complexes have been the most studied catalysts for this important transformation, but the selectivities for alcohols with unreduced ORMs are often poor or difficult to control owing to competitive adsorption and reduction between the aldehyde group and the ORMs on the catalytic active centers. Although the selectivity towards alcohols with unreduced ORMs can be enhanced by designing novel ligands for metal complexes; by introducing additives, other metal components, and functional supports; and by designing special structures for supported catalysts, the complex preparation routes, the high cost, and the stability and recyclability of these catalytic systems still limit their large‐scale application.…”

Tuning Nano‐Nickel Catalyst Hydrogenation Aptitude by On‐the‐Fly Zirconium Doping

“…Nano‐Ni parent catalyst (NiTSNH 2 ) was obtained at room temperature conditions, during one‐pot, two‐step synthesis where Ni NPs were grafted on the polymeric resin terminated with amino groups (TentaGel‐S‐NH 2 , TSNH 2 ) . The metal content in NiTSNH 2 was found to be 0.68 % wt . For the modification of the parent catalyst with Zr we applied the procedure adopted to synthesize the Ni−Sn catalyst .…”

“…Additionally, the new catalysts should be when possible made of transition metals, which are abundant and cheap. Our research efforts have been so far focused on hydrogenation reactions catalysed by nano‐Ni catalysts supported on inert polymeric resins and their alteration via on‐the‐fly surface modification to increase the understanding of the processes and improve catalytic performance. We reported on the impact of particle accretion and Sn‐doping on the activity and selectivity in the hydrogenation of α, β – unsaturated aldehydes and ketones.…”