Palladium‐Catalyzed O‐Arylation Reaction Using Different Heterogeneous Catalyst Systems: The Role of Support

Abstract

Palladium complex of 2‐(diphenylphosphino)benzaldehyde (P,N‐ligand) was immobilized on three different amino functionalized supports such as MCM‐41, SBA‐16, and Fe3O4 nanoparticles (NPs) to evaluate their catalytic activity toward O‐arylation reaction. Catalytic results showed that P,N−Pd‐MCM‐41 catalyst exhibited much higher activity than the other two catalysts due to the higher active surface sites and could be reused for several runs without significant loss in its catalytic activity. Notably, the reaction was done under solvent‐free condition which is important from the green chemistry point of view. The catalysts were characterized by different techniques including X‐ray diffraction (XRD), Fourier‐transform infrared spectroscopy (FT‐IR), thermogravimetric analysis (TGA), transmission electron micrograph (TEM), scanning electron microscopy (SEM), X‐ray photoelectron spectroscopy (XPS), energy dispersive X‐ray spectroscopy (EDS), elemental analysis (CHN), inductively coupled plasma (ICP) spectroscopy, and N2 adsorption–desorption analysis.

Copper supported silica-based nanocatalysts for CuAAC and cross-coupling reactions

“…To satisfy the industrial needs, a low-cost ligand and metal ion with large turn-over frequency (TOF) are used compared with the earlier reported Pd catalyst. 195 The Fe 3 O 4 prepared by the co-precipitation process was coated with SiO 2 to increase stability. Fe 3 -O 4 @SiO 2 condensed with APTES underwent further reaction with 2-hydroxybenzophenone to provide the nanoparticle Schiff base (N,O@AS-MNPs) that can be separated by an external magnet.…”