scholarly journals Copper based on diaminonaphthalene-coated magnetic nanoparticles as robust catalysts for catalytic oxidation reactions and C–S cross-coupling reactions

RSC Advances ◽  
2021 ◽  
Vol 11 (16) ◽  
pp. 9366-9380
Author(s):  
Nasrin Yarmohammadi ◽  
Mohammad Ghadermazi ◽  
Roya Mozafari
Keyword(s):  
Magnetic Nanoparticles ◽  
Catalytic Oxidation ◽  
High Efficiency ◽  
Cross Coupling ◽  
Organic Reactions ◽  
Coupling Reactions ◽  
Oxidation Reactions ◽  
Cross Coupling Reactions ◽  
Toxic Materials

This green-based catalyst with non-toxic materials and high efficiency is used in organic reactions.

Cu(III)-Mediated Aerobic Oxidations

Synthesis ◽  
2018 ◽  
Vol 51 (02) ◽  
pp. 334-358 ◽  
Author(s):  
Jean-Philip Lumb ◽  
Kenneth Esguerra
Keyword(s):  
Cross Coupling ◽  
Coupling Reactions ◽  
Oxidation Reactions ◽  
General Introduction ◽  
Model Complexes ◽  
Bond Forming ◽  
Cross Coupling Reactions ◽  
Carbon Carbon Bond ◽  
Bond Forming Reactions ◽  
Type 3

CuIII species have been invoked in many copper-catalyzed transformations including cross-coupling reactions and oxidation reactions. In this review, we will discuss seminal discoveries that have advanced our understanding of the CuI/CuIII redox cycle in the context of C–C and C–heteroatom aerobic cross-coupling reactions, as well as C–H oxidation reactions mediated by CuIII–dioxygen adducts.1 General Introduction2 Early Examples of CuIII Complexes3 Aerobic CuIII-Mediated Carbon–Heteroatom Bond-Forming Reactions4 Aerobic CuIII-Mediated Carbon–Carbon Bond-Forming Reactions5 Bioinorganic Studies of CuIII Complexes from CuI and O2 5.1 O2 Activation5.2 Biomimetic CuIII Complexes from CuI and Dioxygen5.2.1 Type-3 Copper Enzymes and Dinuclear Cu Model Complexes5.2.2 Particulate Methane Monooxygenase and Di- and Trinuclear Cu Model Complexes5.2.3 Dopamine–β-Monooxygenase and Mononuclear Cu Model Complexes6 Conclusion

scholarly journals Curse or Blessing? Influence of Impurities on Cross-Coupling— Guideline for Elucidating Catalysts

2021 ◽  
Author(s):  
Zoltán Novák ◽  
Réka Adamik ◽  
János T. Csenki ◽  
Ferenc Béke ◽  
Regina Gavaldik ◽  
...  
Keyword(s):  
Catalytic Effect ◽  
High Efficiency ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
Impurity Effect ◽  
Coupling Reactions ◽  
Chemical Research ◽  
Cross Coupling Reactions ◽  
Complete Exclusion ◽  
Influence Of Impurities

Several efforts have been made for the replacement of noble metal palladium in cross-coupling reactions, maintaining high efficiency of the target transformation. In several cases it is possible to perform the chemistry of palladium with related metals, and their activity was supported with mechanistic studies. Moreover, the complete exclusion of palladium is also in focus. Very recently it was demonstrated that special amine organocatalysts could catalyse Suzuki-Miyaura coupling reaction. Here we show that in this recent transformation homeopathic palladium impurities and trace phosphorous species originated from the conditions used for the organocatalyst synthesis are responsible for the catalytic effect instead of the amine species. This finding confirms the power of palladium in cross-coupling and draw the attention of impurity effect in this field of chemical research. In this article, we represent general guidelines for elucidating the real catalyst of reactions.<br>

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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