Convenient Synthesis of Palladium Nanoparticles and Catalysis of Hiyama Coupling Reaction in Water

Abstract

An efficient synthesis of Pd nanoparticles in water has been developed using a Fischer carbene complex of tungsten as the reductant and PEG as the capping agent. The colloidal palladium (1 mol %) efficiently catalyzes Hiyama cross-coupling reactions performed in air. Excellent yields of products were obtained with a wide range of substrates. Catalytic activity and stability of the nanoparticles were found to be inversely correlated.

Magnetic Pd–Fe3O4 Heterodimer Nanocrystals as Recoverable Catalysts for Ligand‐Free Hiyama Cross‐Coupling Reactions

“…However, the use of phosphine ligands is undesirable due to their moisture‐ and air‐sensitivity, toxicity, purification problems associated with their consequent oxidation into phosphine‐oxide species, and added cost . Heterogeneous Hiyama cross‐coupling reactions have also been reported with four to six times recoverable palladium nanocatalyst systems including the use of immobilized catalysts and nanoparticles . Inspired by these results, herein, we report that the Pd–Fe 3 O 4 nanocrystals are efficient recyclable catalysts for Hiyama cross‐coupling reactions under ligand‐free conditions.…”

Tuning the Selectivity of AuPd Nanoalloys towards Selective Dehydrogenative Alkyne Silylation

“…Upon irradiation with UV light, I 2959 fragments to give a ketyl and a benzoyl radical in a Norrish type 1 reaction. These radicals can act as one‐electron donors to reduce Au 3+ and Pd 2+ to the corresponding metal atoms, whereas PEG 2000 ensures stabilization of the in situ generated nanoparticles (Scheme a) . The thus obtained solution containing the nanoalloys was then directly used to catalyze the CDC of alkyne 1 a with hydrosilane 2 .…”

Synthesis of cobalt, palladium, and rhenium nanoparticles

“…Chemical reduction methods are widely used to produce PdNPs. Srimani et al [113] synthesized PdNPs using a Fischer carbene complex of tungsten and polyethylene glycol (PEG) as the reductant and capping agent, respectively. These PdNPs, having high stability after 1 month, exhibited extensive catalytic activity in Hiyama cross-coupling reactions.…”