Phosphinite-functionalized silica and hexagonal mesoporous silica containing palladium nanoparticles in Heck coupling reaction: synthesis, characterization, and catalytic activity

Abstract

The preparation of phosphinite-functionalized silica and hexagonal mesoporous silica containing palladium nanoparticles is described. These catalysts were explored as heterogeneous catalytic systems in HCR with different substrates.

Palladium nanoparticles embedded chitosan/poly(vinyl alcohol) composite nanofibers as an efficient and stable heterogeneous catalyst for Heck reaction

“…5,6 As palladium species are generally deposited on the surface of solid matrices, solid matrices are ordinary fabricated into highly porous structure with larger specific surface area for the high dispersion of palladium species. [7][8][9][10] However, the porous structure often decrease its mechanical property, leading to decrement of the catalyst stability. In addition, the chelating strength of the palladium species with solid matrices are usually not powerful enough to prevent the palladium leaching in catalysis procedure, especially in harsh reaction (e.g., high reaction temperature, polar solvent).…”

Long chain ionic liquid-assisted synthesis of PS/Pd beads and hierarchical porous Pd–SiO2

“…Ordered porous materials can also be considered as an ideal scaffold for loading Pd NPs. 22,23 Particularly, bimodal mesoporous-macroporous inorganic materials possess increased mass transport through its macropores as well as retaining a specic surface area on the level of ne mesoporous structures. 24 In previously reported preparation of Pd NPs-loaded ordered porous silica, the commonly used method is simple impregnation with metal salt solutions into porous channels and further reduction to form Pd NPs in the porous silica channels.…”

Heck and oxidative boron Heck reactions employing Pd(II) supported amphiphilized polyethyleneimine‐functionalized MCM‐41 (MCM‐41@aPEI‐Pd) as an efficient and recyclable nanocatalyst

“…Palladium nanoparticles were encapsulated in various forms of silica supports that were represented improved properties in carbon-carbon bondforming reactions gradually. [25][26][27][28][29] By now, catalytic activity of covalently or noncovalently functionalized hyperbranched macromolecules like hyperbranched polyethylenimine (HPEI) has received limited attention. [30][31][32][33][34] Therefore, it is worthwhile to develop a general, simple, and scalable approach to fabricate a reusable and stable nanocatalyst.…”