Simple and Practical Synthesis of Various New Nickel Boride-Based Nanocomposites and their Applications for the Green and Expeditious Reduction of Nitroarenes to Arylamines under Wet-Solvent-Free Mechanochemical Grinding

Abstract

In this paper, we report a simple synthesis of four new nickel boride-based nanocomposites, namely Ni2B@ZrCl4, Ni2B@Cu2O, Ni2B@CuCl2 and Ni2B@FeCl3, from commercially available and cheap starting materials. All of the new Ni2B-based nanocomposites were well characterized by Fourier-transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. Further, the catalytic applications of these new nanocomposites were successfully evaluated in the wet-solvent-free reduction of aromatic nitro compounds to arylamines with sodium borohydride (NaBH4) at room temperature by a mechanochemical grinding technique. All the introduced catalytic systems provide excellent yields of arylamines in very short reaction times for a wide range of substrates. Also, recoverability and reusability of the new nanocomposites were investigated.

Synthesis of a Crizotinib Intermediate via Highly Efficient Catalytic Hydrogenation in Continuous Flow

“…According to the study on the mechanism of nitro-catalyzed hydrogenation in the references, the direction of catalyst design and the improvement of reaction selectivity and conversion were indicated. − We speculated that there might have been two pathways for the reduction of compound I to compound II (Scheme ).…”

Recent Advances in Mechanochemical Organic Synthesis

“…Among the recent examples of oxidation/reduction reactions are Cannizzaro disproportionation of furfural [73] and benzylic oxidation of lignin by oxone and TEMPO [74]. Nitro group was reduced by Ni 2 B-NaBH 4 system [75] and by AuNPscatalyzed reaction with cyclodextrins as additives [76].…”

Rice husk-SiO2 supported bimetallic Fe–Ni nanoparticles: as a new, powerful magnetic nanocomposite for the aqueous reduction of nitro compounds to amines

“…Products 1-11 are known compounds, and their NMR spectra are in accordance with those reported in the literature. [63][64][65][66][67][68] Aniline (1). Yellow oil.…”