scholarly journals Mesoporous-silica-coated palladium-nanocubes as recyclable nanocatalyst in C–C-coupling reaction – a green approach

RSC Advances ◽  
2020 ◽  
Vol 10 (44) ◽  
pp. 26504-26507
Author(s):  
Darius Rohleder ◽  
Philipp Vana
Keyword(s):  
Mesoporous Silica ◽  
Coupling Reaction ◽  
Product Yield ◽  
Silica Shell ◽  
Single Step ◽  
Core Shell ◽  
Coating Process ◽  
Coupling Reactions ◽  
Green Approach

A green approach: in a single-step coating process a mesoporous silica shell was tailored onto palladium-nanocubes. Along with a PEG-matrix this core–shell-nanocatalyst could be recovered after C–C-coupling reactions and reused without any significant decrease in product yield.

A NIR light-triggered drug delivery system using core–shell gold nanostars–mesoporous silica nanoparticles based on multiphoton absorption photo-dissociation of 2-nitrobenzyl PEG

2019 ◽  
Vol 55 (61) ◽  
pp. 9039-9042 ◽  
Author(s):  
Andy Hernández-Montoto ◽  
Mónica Gorbe ◽  
Antoni Llopis-Lorente ◽  
José Manuel Terrés ◽  
Roberto Montes ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Mesoporous Silica ◽  
Silica Nanoparticles ◽  
Drug Delivery System ◽  
Mesoporous Silica Nanoparticles ◽  
Silica Shell ◽  
Multiphoton Absorption ◽  
Core Shell ◽  
Gold Nanostars ◽  
Nir Light

Gold nanostars coated with a mesoporous silica shell and functionalised with PEG containing photolabile 2-nitrobenzyl moieties released doxorubicin after NIR light irradiation.

scholarly journals Palladium nanoparticles supported on chitin-based nanomaterials as heterogeneous catalysts for the Heck coupling reaction

2020 ◽  
Vol 16 ◽  
pp. 2477-2483 ◽  
Author(s):  
Tony Jin ◽  
Malickah Hicks ◽  
Davis Kurdyla ◽  
Sabahudin Hrapovic ◽  
Edmond Lam ◽  
...  
Keyword(s):  
Heterogeneous Catalysts ◽  
Coupling Reaction ◽  
Product Yield ◽  
Pd Nanoparticles ◽  
Coupling Model ◽  
Coupling Reactions ◽  
Heck Coupling ◽  
One Pot ◽  
Cross Coupling Reactions ◽  
Chitin And Chitosan

In this report, chitin and chitosan nanocrystals were used as biomass-based supports for Pd nanoparticles (NPs) used as a heterogeneous catalyst for the Heck coupling reaction. By using a one-pot fabrication method, a Pd salt precursor was directly reduced and deposited onto these nanocrystal catalysts. Characterization of these nanocomposites showed disperse Pd NPs on the surfaces of the chitinous nanocrystals. Heck coupling model reactions revealed full product yield in relatively benign conditions, outcompeting the use of other catalysts supported on biomass-based nanomaterials, including cellulose nanocrystals. These initial results show the potential for using chitinous nanomaterials as effective catalyst supports in cross-coupling reactions.

Fe3O4@mSiO2 core–shell nanocomposite capped with disulfide gatekeepers for enzyme-sensitive controlled release of anti-cancer drugs

2015 ◽  
Vol 3 (6) ◽  
pp. 1010-1019 ◽  
Author(s):  
Chunyu Yang ◽  
Wei Guo ◽  
Liru Cui ◽  
Na An ◽  
Ting Zhang ◽  
...  
Keyword(s):  
Controlled Release ◽  
Drug Release ◽  
Mesoporous Silica ◽  
Cancer Treatment ◽  
Silica Shell ◽  
Core Shell ◽  
Passive Targeting ◽  
Anti Cancer ◽  
Multifunctional Nanocarriers ◽  
Nanoparticle Core

Multifunctional nanocarriers based on the magnetic Fe3O4 nanoparticle core and bis-(3-carboxy-4-hydroxy phenyl) disulfide modified mesoporous silica shell were synthesized for cancer treatment through passive targeting and enzyme-sensitive drug release.

scholarly journals A green approach to the synthesis of Ag doped nano magnetic γ-Fe2O3@SiO2-CD core–shell hollow spheres as an efficient and heterogeneous catalyst for ultrasonic-assisted A3 and KA2 coupling reactions

RSC Advances ◽  
2017 ◽  
Vol 7 (58) ◽  
pp. 36807-36818 ◽  
Author(s):  
S. Sadjadi ◽  
M. Malmir ◽  
M. M. Heravi
Keyword(s):  
Heterogeneous Catalyst ◽  
Hollow Spheres ◽  
Core Shell ◽  
Coupling Reactions ◽  
Step Process ◽  
Green Approach ◽  
Ultrasonic Assisted ◽  
Template Free

Using a green approach and ultrasonic-assisted template-free five-step process, a novel heterogeneous catalyst, γ-Fe2O3@SiO2-CD/Ag hollow spheres (h-Fe2O3@SiO2-CD/Ag), was fabricated.

Multifunctional Fe3O4@nSiO2@mSiO2/Pr-Imi-NH2·Ag core–shell microspheres as highly efficient catalysts in the aqueous reduction of nitroarenes: improved catalytic activity and facile catalyst recovery

RSC Advances ◽  
2016 ◽  
Vol 6 (48) ◽  
pp. 41871-41877 ◽  
Author(s):  
Mina Jafari Nasab ◽  
Ali Reza Kiasat
Keyword(s):  
Catalytic Activity ◽  
Iron Oxide ◽  
Mesoporous Silica ◽  
Superparamagnetic Iron Oxide ◽  
Silica Shell ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Functionalized Mesoporous Silica ◽  
Iron Oxide Core ◽  
Core Shell Nanoparticles

Core@shell nanoparticles with a superparamagnetic iron oxide core, a middle nonporous silica shell, and an outer organo functionalized mesoporous silica shell were synthesized and evaluated for immobilizing Ag nanoparticles.

Palladium Supported on Functionalized Mesoporous Silica: Synthesis, Structure and Catalytic Properties in Suzuki-Miyaura Coupling Reactions

2013 ◽  
Vol 750-752 ◽  
pp. 1083-1086
Author(s):  
Guo Heng Zhang ◽  
Pei Yu Wang ◽  
Xiu Fang Wei
Keyword(s):  
Mesoporous Silica ◽  
Palladium Nanoparticles ◽  
Catalytic Properties ◽  
Coupling Reaction ◽  
Pd Nanoparticles ◽  
Coupling Reactions ◽  
Silica Support ◽  
Functionalized Mesoporous Silica ◽  
Transmission Electron ◽  
Silica Synthesis

Pd nanoparticles supported in functionalized mesoporous silica were prepared. Mesoporous silica support was modified with [3-(2-aminoethyl aminopropyl)] trimethoxysilane. The functionalized mesoporous silica can be loaded with palladium and the resulting material used as a catalyst for the Suzuki-Miyaura coupling reactions. Highly dispersed and uniform palladium nanoparticles could be detected using transmission electron microscopy. The Pd-SBA-15 nanocomposite exhibits an excellent catalytic activity and low Pd leaching for the Suzuki-Miyaura coupling reaction.

An Iron-Based Catalyst Enables The Enantioconvergent Synthesis of Chiral 1,1-Diarylalkanes Through a Suzuki-Miyaura Cross-Coupling Reaction

2020 ◽  
Author(s):  
Chet Tyrol ◽  
Nang Yone ◽  
Connor Gallin ◽  
Jeffery Byers
Keyword(s):  
Coupling Reaction ◽  
Cross Coupling ◽  
Coupling Reactions ◽  
Radical Intermediates ◽  
Cross Coupling Reactions ◽  
Cross Coupling Reaction ◽  
Boronic Esters ◽  
Carbon Centered Radical ◽  
Iron Based ◽  
High Yields

By using an iron-based catalyst, access to enantioenriched 1,1-diarylakanes was enabled through an enantioselective Suzuki-Miyaura crosscoupling reaction. The combination of a chiral cyanobis(oxazoline) ligand framework and 1,3,5-trimethoxybenzene additive were essential to afford high yields and enantioselectivities in cross-coupling reactions between unactivated aryl boronic esters and a variety of benzylic chlorides, including challenging ortho-substituted benzylic chloride substrates. Mechanistic investigations implicate a stereoconvergent pathway involving carbon-centered radical intermediates.

Zinc Sulfamate Catalyzed Efficient Selective Synthesis of Benzimidazole Derivatives under Ambient Conditions

2019 ◽  
Vol 16 (9) ◽  
pp. 740-749
Author(s):  
Sushil R. Mathapati ◽  
Arvind H. Jadhav ◽  
Mantosh B. Swami ◽  
Jairaj K. Dawle
Keyword(s):  
Benzimidazole Derivative ◽  
Sulfamic Acid ◽  
Aromatic Aldehydes ◽  
Catalytic Amount ◽  
Product Yield ◽  
Lewis Acidity ◽  
Benzimidazole Derivatives ◽  
Ambient Conditions ◽  
Reaction Condition ◽  
Green Approach

Zinc sulfamate (Zn(NH2SO3)2 is a derivative of sulfamic acid (H3NSO3) which possesses “Lewis acidity” and finds well suited in a number of catalytic applications. The present paper describes an efficient, eco-friendly, and clean synthesis of 2-substituted benzimidazole derivatives by reacting diverse o-phenylenediamine with various substituted aromatic aldehydes using a catalytic amount of zinc sulfamate in ethanol at ambient temperature. As a result, 10 mol.% of Zinc sulfamate catalyst showed 92% of respective product yield with 100% conversion using short reaction period in ethanol. Meanwhile, effect of reaction parameters, such as amount of catalyst, different solvents, and reaction temperature on reaction product, was also studied. In addition, in the optimized reaction condition various substituted biological important benzimidazoles derivatives were prepared by using optimized reaction condition in good to efficient yield. In addition, possible reaction mechanism in the presence of zinc sulfamate for the preparation of benzimidazole derivative was sketched and discussed. The present green approach showed significances with faster reaction rate with inexpensive catalyst, which showed excellent and clean yield of benzimidazole in mild reaction condition with easy work-up procedure.

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