Mesoporous Silica MCM-41 SupportedN-Heterocyclic Carbene-Pd Complex for Heck and Sonogashira Coupling Reactions

2014 ◽  
Vol 62 (1) ◽  
pp. 33-40 ◽  
Author(s):  
Shaheen M. Sarkar ◽  
Mashitah Mohd Yusoff ◽  
Md. Lutfor Rahman
Keyword(s):  
Mesoporous Silica ◽  
Coupling Reactions ◽  
Sonogashira Coupling ◽  
Mcm 41

ChemInform Abstract: Immobilization of Pd Catalysts on Mesoporous Silica for Amine- and Copper-Free Sonogashira Coupling Reactions.

ChemInform ◽  
2008 ◽  
Vol 39 (48) ◽  
Author(s):  
Chariklia Sotiriou-Leventis ◽  
Xiaojiang Wang ◽  
Sudhir Mulik ◽  
Arumugam Thangavel ◽  
Nicholas Leventis
Keyword(s):  
Mesoporous Silica ◽  
Coupling Reactions ◽  
Sonogashira Coupling ◽  
Pd Catalysts

scholarly journals Green Synthesis of Cu Nanoparticles in Modulating the Reactivity of Amine-Functionalized Composite Materials towards Cross-Coupling Reactions

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2260
Author(s):  
Surjyakanta Rana ◽  
G. Bishwa Bidita Varadwaj ◽  
Sreekanth B. Jonnalagadda
Keyword(s):  
Graphene Oxide ◽  
Catalytic Activity ◽  
Composite Materials ◽  
Mesoporous Silica ◽  
Reduced Graphene Oxide ◽  
Coupling Reactions ◽  
Cu Nanoparticles ◽  
Amine Functionalized ◽  
Reduced Graphene ◽  
Mcm 41

Control over both dispersion and the particle size distribution of supported metal particles is of paramount importance for the catalytic activity of composite materials. We describe the synthesis of materials with Cu nanoparticles well-dispersed on different amine-functionalized supports, using the extract of Wallich Spurge as a green, reducing agent. Graphene oxide (GO), mesoporous silica (MCM-41), mesoporous zirconia, and reduced graphene oxide-mesoporous silica (RGO-MCM-41) were explored as supports. Cu nanoparticles were better stabilized on RGO-MCM-41 compared to other supports. The novel composite materials were characterized by X-ray diffraction (XRD), Raman spectra, Scanning electron microscope (SEM), Transmission electron microscopy analysis and HR-TEM. SEM and EDX techniques. High angle XRD confirmed the conversion of graphene oxide to reduced graphene oxide (RGO) with plant extract as a reducing agent. Both XRD and TEM techniques confirmed the Cu nanoparticle formation. The catalytic activity of all the prepared materials for the Ullmann coupling reactions of carbon-, oxygen-, and nitrogen-containing nucleophiles with iodobenzene was evaluated. From the results, 5 wt% Cu on amine-functionalized reduced graphene oxide/mesoporous silica nanocomposite (5 wt%Cu(0)-AAPTMS@RGO-MCM-41) exhibited excellent efficiency with 97% yield of the C-C coupling product in water at 80 °C in 5 h. The activity remained unaltered almost up to the fourth cycle. The Cu nanoparticles stabilized by organic amine group on RGO hybrid facilitated sustained activity.

Encapsulation of Pd Complex in Ionic Liquid on Highly Ordered Mesoporous Silica MCM-41

2007 ◽  
Vol 7 (11) ◽  
pp. 3880-3883 ◽  
Author(s):  
M. S. Sarkar ◽  
Huili Qiu ◽  
Myung-Jong Jin
Keyword(s):  
Ionic Liquid ◽  
Mesoporous Silica ◽  
Significant Loss ◽  
Palladium Acetate ◽  
High Catalytic Activity ◽  
Coupling Reactions ◽  
Ordered Mesoporous Silica ◽  
Heck Coupling ◽  
Ordered Mesoporous ◽  
Mcm 41

Palladium acetate was encapsulated onto highly ordered mesoporous silica MCM-41 with the aid of ionic liquid. The immobilized Pd complex can efficiently catalyze Heck coupling reactions of activated and non-activated aryl halides with acrylates. The Pd catalyst exhibited remarkably high catalytic activity and outstanding stability. Moreover, the immobilized palladium acetate could be recycled at least six times without significant loss of activity.

Immobilization of Pd Catalysts on Mesoporous Silica for Amine- and Copper-Free Sonogashira Coupling Reactions

2008 ◽  
Vol 38 (14) ◽  
pp. 2285-2298 ◽  
Author(s):  
Chariklia Sotiriou-Leventis ◽  
Xiaojiang Wang ◽  
Sudhir Mulik ◽  
Arumugam Thangavel ◽  
Nicholas Leventis
Keyword(s):  
Mesoporous Silica ◽  
Coupling Reactions ◽  
Sonogashira Coupling ◽  
Pd Catalysts
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