Palladium(II) anchored on polydopamine coated-magnetic nanoparticles (Fe3O4@PDA@Pd(II)): A heterogeneous and core–shell nanocatalyst in Buchwald–Hartwig C–N cross coupling reactions

Polyhedron ◽  
2018 ◽  
Vol 156 ◽  
pp. 64-71 ◽  
Author(s):  
Hojat Veisi ◽  
Pegah Sarachegol ◽  
Saba Hemmati
Keyword(s):  
Magnetic Nanoparticles ◽  
Cross Coupling ◽  
Core Shell ◽  
Coupling Reactions ◽  
Cross Coupling Reactions ◽  
Magnetic Nanoparticles Fe3o4

Preparation of recoverable Fe3O4@PANI–PdII core/shell catalysts for Suzuki carbonylative cross-coupling reactions

2014 ◽  
Vol 38 (9) ◽  
pp. 4622-4627 ◽  
Author(s):  
Xiaohang Zhu ◽  
Jianrui Niu ◽  
Fengwei Zhang ◽  
Jinghui Zhou ◽  
Xinzhe Li ◽  
...  
Keyword(s):  
Cross Coupling ◽  
Catalytic Performance ◽  
Core Shell ◽  
Coupling Reactions ◽  
Cross Coupling Reactions

We report on the synthesis, characterization and catalytic performance of a palladium-based superparamagnetic catalyst of Fe3O4@polyaniline core/shell microspheres (Fe3O4@PANI–PdII).

scholarly journals Magnetically Recoverable Nanoparticulate Catalysts for Cross-Coupling Reactions: The Dendritic Support Influences the Catalytic Performance

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3345
Author(s):  
Nina V. Kuchkina ◽  
Svetlana A. Sorokina ◽  
Alexey V. Bykov ◽  
Mikhail G. Sulman ◽  
Lyudmila M. Bronstein ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Magnetic Nanoparticles ◽  
Magnetic Separation ◽  
Reaction Times ◽  
Cross Coupling ◽  
Pd Nanoparticles ◽  
Coupling Reactions ◽  
Green Solvents ◽  
Cross Coupling Reactions ◽  
Strong Stabilization

Carbon-carbon cross-coupling reactions are among the most important synthetic tools for the preparation of pharmaceuticals and bioactive compounds. However, these reactions are normally carried out using copper, phosphines, and/or amines, which are poisonous for pharmaceuticals. The use of nanocomposite catalysts holds promise for facilitating these reactions and making them more environmentally friendly. In the present work, the PEGylated (PEG stands for poly(ethylene glycol) pyridylphenylene dendrons immobilized on silica loaded with magnetic nanoparticles have been successfully employed for the stabilization of Pd2+ complexes and Pd nanoparticles. The catalyst developed showed excellent catalytic activity in copper-free Sonogashira and Heck cross-coupling reactions. The reactions proceeded smoothly in green solvents at low palladium loading, resulting in high yields of cross-coupling products (from 80% to 97%) within short reaction times. The presence of magnetic nanoparticles allows easy magnetic separation for repeated use without a noticeable decrease of catalytic activity due to the strong stabilization of Pd species by rigid and bulky dendritic ligands. The PEG dendron periphery makes the catalyst hydrophilic and better suited for green solvents. The minor drop in activity upon the catalyst reuse is explained by the formation of Pd nanoparticles from the Pd2+ species during the catalytic reaction. The magnetic separation and reuse of the nanocomposite catalyst reduces the cost of target products as well as energy and material consumption and diminishes residual contamination by the catalyst. These factors as well as the absence of copper in the catalyst makeup pave the way for future applications of such catalysts in cross-coupling reactions.

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