A novel polymer containing phosphorus-nitrogen ligands for stabilization of palladium nanoparticles: An efficient and recyclable catalyst for Suzuki and Sonogashira reactions in neat water
A new polymer containing phosphorus and nitrogen ligands was successfully synthesized, characterized and used for the stabilization of highly monodispersed palladium nanoparticles having an average diameter of 2-3 nm. The thermally stable heterogeneous catalyst was successfully applied in Suzuki-Miyaura and copper-free Sonogashira-Hagihara coupling reactions of aryl halides under low palladium loading conditions. Reactions were proceeded in neat water without using any organic co-solvents. The catalyst was successfully recycled for the sample Suzuki-Miyaura reaction nine consecutive times with small drop in catalytic activity.
Gholinejad,Hamed,Biji
p. 14293 - 14303
(2015/08/24)
Aerobic ligand-free Suzuki coupling reaction of aryl chlorides catalyzed by in situ generated palladium nanoparticles at room temperature
An aerobic, ligand-free Suzuki coupling reaction catalyzed by in situ generated palladium nanoparticles in polyethylene glycol with an average molecular weight of 400 Da (PEG-400) at room temperature has been developed. This catalytic system is a very simple and highly active protocol for the Suzuki coupling of aryl chlorides with arylboronic acids, which proceed smoothly in excellent yields in short times using low catalyst loadings. Control experiments demonstrated that the Suzuki reaction catalyzed by the in situ generated palladium nanoparticles can be carried out much quicker than that using the preprepared particles under the same conditions. The formation of palladium nanoparticles in PEG-400 was promoted by arylboronic acids.
Han, Wei,Liu, Chun,Jin, Zilin
supporting information; experimental part
p. 501 - 508
(2009/04/08)
Self-supported heterogeneous star-shaped oxime-palladacycle catalysts for the Suzuki coupling reactions
A novel strategy to synthesize heterogeneous star-shaped oxime-palladacycle catalysts, which exhibited good catalytic activity and recyclability in the Suzuki coupling of aryl bromides and chlorides, was described. Georg Thieme Verlag Stuttgart.