scholarly journals Copper nanoparticles grafted on carbon microspheres as novel heterogeneous catalysts and their application for the reduction of nitrophenol and one-pot multicomponent synthesis of hexahydroquinolines

2018 ◽  
Vol 42 (2) ◽  
pp. 1092-1098 ◽  
Author(s):  
Tibor Pasinszki ◽  
Melinda Krebsz ◽  
Győző György Lajgut ◽  
Tünde Kocsis ◽  
László Kótai ◽  
...  
Keyword(s):  
Copper Nanoparticles ◽  
Heterogeneous Catalysts ◽  
Cu Nanoparticles ◽  
Carbon Microspheres ◽  
Multicomponent Synthesis ◽  
One Pot ◽  
Carbon Microsphere

Carbon microsphere-supported Cu nanoparticles were fabricated, characterized, and applied for synthesis.

scholarly journals A ONE POT THREE-COMPONENT SYNTHESIS OF SPIROOXOINDOLES USING Cu-NANOPARTICLES GRAFTED ON CARBON MICROSPHERES AS CATALYST

2019 ◽  
Vol 8 (5) ◽  
pp. 153
Author(s):  
N. S. Kaminwar ◽  
S. B. Patwari ◽  
Santosh P. Goskulwad ◽  
Santosh D. More ◽  
Sanjay K. Vyawahare ◽  
...  
Keyword(s):  
Cu Nanoparticles ◽  
Carbon Microspheres ◽  
One Pot

scholarly journals Chitosan Decorated Copper Nanoparticles as Efficient Catalyst for One-Pot Multicomponent Synthesis of Novel Quinoline Derivatives: Sustainable Perspectives

2018 ◽  
Author(s):  
Kahdijah S. Alghamdi ◽  
Nesreen S.I. Ahmed ◽  
D. Bakhotmah ◽  
Mohamed Mokhtar
Keyword(s):  
Copper Nanoparticles ◽  
Current Method ◽  
Product Yield ◽  
Reaction Yield ◽  
Quinoline Derivatives ◽  
Multicomponent Synthesis ◽  
High Turnover ◽  
One Pot ◽  
Efficient Catalyst ◽  
Green Protocol

Chitosan decorated copper nanoparticles catalysts (CSCuNPs) were synthesized via reduction methods utilizing green protocol. The CSCuNPs catalysts were tested for the synthesis of quinoline derivatives utilizing one-pot multicomponent reaction (MCR) under ultrasonic irradiation. The best catalyst (Cu-CS-NPs) that provided good conversion reaction yield and high turnover frequency (TOF) was characterized using FTIR, TGA, XRD, TEM and XPS techniques. Generalization of the scope of the proposed catalytic process was studied using different aldehydes. Excellent products yield and high TOF in even shorter reaction time (~5 min) was attained. Recyclability performance of the catalyst over five times re-use without detectable loss in product yield was recorded. The current method is green process utilizing environmentally benign catalyst and considered to be promising sustainable protocol for the synthesis of fine chemicals.

scholarly journals Chitosan Decorated Copper Nanoparticles as Efficient Catalyst for One-Pot Multicomponent Synthesis of Novel Quinoline Derivatives: Sustainable Perspectives

2018 ◽  
Author(s):  
Kahdijah S. Alghamdi ◽  
Nesreen Ahmed ◽  
D. Bakhotmah ◽  
Mohamed Mokhtar M. Mostafa
Keyword(s):  
Copper Nanoparticles ◽  
Current Method ◽  
Product Yield ◽  
Reaction Yield ◽  
Quinoline Derivatives ◽  
Multicomponent Synthesis ◽  
High Turnover ◽  
One Pot ◽  
Efficient Catalyst ◽  
Green Protocol

Chitosan decorated copper nanoparticles catalysts (CSCuNPs) were synthesized via reduction methods utilizing green protocol. The CSCuNPs catalysts were tested for the synthesis of quinoline derivatives utilizing one-pot multicomponent reaction (MCR) under ultrasonic irradiation. The best catalyst (Cu-CS-NPs) that provided good conversion reaction yield and high turnover frequency (TOF) was characterized using FTIR, TGA, XRD, TEM and XPS techniques. Generalization of the scope of the proposed catalytic process was studied using different aldehydes. Excellent products yield and high TOF in even shorter reaction time (~5 min) was attained. Recyclability performance of the catalyst over five times re-use without detectable loss in product yield was recorded. The current method is green process utilizing environmentally benign catalyst and considered to be promising sustainable protocol for the synthesis of fine chemicals.

scholarly journals Recent Progresses in the Multicomponent Synthesis of Dihydropyridines by Applying Sustainable Catalysts Under Green Conditions

2021 ◽  
Vol 9 ◽  
Author(s):  
Immandhi Sai Sonali Anantha ◽  
Nagaraju Kerru ◽  
Suresh Maddila ◽  
Sreekantha B. Jonnalagadda
Keyword(s):  
Heterogeneous Catalysts ◽  
Reaction Times ◽  
Cost Effective ◽  
Multicomponent Synthesis ◽  
One Pot ◽  
Catalytic Systems ◽  
Heterogeneous Catalytic ◽  
Significant Efficacy ◽  
Magnetic Silica ◽  
Active Methylene

The synthesis of dihydropyridines, valuable molecules with diverse therapeutic properties, using eco-friendly heterogeneous catalysts as a green alternative received significant consideration. By selecting appropriate precursors, these compounds can be readily modified to induce the desired properties in the target product. This review focused on synthesising diverse dihydropyridine derivatives in single-pot reactions using magnetic, silica, and zirconium-based heterogeneous catalytic systems. The monograph describes preparation techniques for various catalyst materials in detail. It covers facile and benign magnetic, silica, zirconium-based, and ionic liquid catalysts, exhibiting significant efficacy and consistently facilitating excellent yields in short reaction times and in a cost-effective way. Most of the designated protocols employ Hantzsch reactions involving substituted aldehydes, active methylene compounds, and ammonium acetate. These reactions presumably follow Knoevenagel condensation followed by Michael addition and intra-molecular cyclisation. The multicomponent one-pot protocols using green catalysts and solvents have admirably increased the product selectivity and yields while minimising the reaction time. These sustainable catalyst materials retain their viability for several cycles reducing the expenditure are eco-friendly.

scholarly journals Graphene hydrogels with embedded metal nanoparticles as efficient catalysts in 4-nitrophenol reduction and methylene blue decolorization

2016 ◽  
Vol 18 (4) ◽  
pp. 47-55 ◽  
Author(s):  
Kamila Żelechowska ◽  
Izabela Kondratowicz ◽  
Maria Gazda
Keyword(s):  
Methylene Blue ◽  
Catalytic Activity ◽  
Metallic Nanoparticles ◽  
Heterogeneous Catalysts ◽  
Model Reaction ◽  
Synthesis And Characterization ◽  
Cu Nanoparticles ◽  
One Pot ◽  
Nitrophenol Reduction

Abstract Synthesis and characterization of the graphene hydrogels with three different metallic nanoparticles, that is Au, Ag and Cu, respectively is presented. Synthesized in a one-pot approach graphene hydrogels with embedded metallic nanoparticles were tested as heterogeneous catalysts in a model reaction of 4-nitrophenol reduction. The highest activity was obtained for graphene hydrogel with Cu nanoparticles and additional reaction of methylene blued degradation was evaluated using this system. The obtained outstanding catalytic activity arises from the synergistic effect of graphene and metallic nanoparticles. The hydrogel form of the catalyst benefits in the easiness in separation from the reaction mixture (for example using tweezers) and reusability.

scholarly journals Eco-friendly Synthesis of 1, 4-Dihydropyrano-[2,3-c] Pyrazoles Using Copper Nanoparticles Grafted on Carbon Microsphere as a Heterogeneous Catalyst

2020 ◽  
Vol 9 (4) ◽  
pp. 1521-1528
Keyword(s):  
Heterogeneous Catalyst ◽  
Copper Nanoparticles ◽  
Reaction Conditions ◽  
One Pot ◽  
Carbon Microsphere ◽  
Excellent Yield

A convenient and efficient one-pot three-component synthesis of 6-amino-4-aryl-5-cyano-3-methyl-1-phenyl-1, 4-dihydropyrano[2, 3-c] pyrazoles was achieved using copper nanoparticles grafted on carbon microsphere (Cu-NP/C) as a reusable heterogeneous catalyst. The synthesis of pyranopyarolzes was carried out under mild reaction conditions affording excellent yield of the corresponding products.

Synthesis of 3,4-Dihydropyrano[c]chromenes Using Carbon Microsphere Supported Copper Nanoparticles (Cu-NP/C) Prepared from Loaded Cation Exchange Resin as a Catalyst

2019 ◽  
Vol 16 (2) ◽  
pp. 288-293
Author(s):  
Yogesh W. More ◽  
Sunil U. Tekale ◽  
Nitishkumar S. Kaminwar ◽  
László Kótai ◽  
Tibor Pasinszki ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Cation Exchange ◽  
Copper Nanoparticles ◽  
Exchange Resin ◽  
Cation Exchange Resin ◽  
Environmentally Benign ◽  
High Yield ◽  
Carbon Microsphere ◽  
Catalytic Material ◽  
Operational Simplicity

Aim and Objective: The present study was performed with the aim to develop an efficient and environmentally benign protocol for the synthesis of biologically siginifcant 3, 4-dihydropyrano[c]chromenes using a new catalytic material. The protocol involves the use of a reusable, environment friendly materials and solvents with operational simplicity. Materials and Methods: Carbon microsphere supported copper nanoparticles (Cu-NP/C) prepared from loaded cation exchange resin were synthesized, characterized with well versed analytical techniques such as XRD, SEM and Raman spectroscopy and the synthesized material was used as a catalyst for the environmentally benign synthesis of 3,4-dihydropyrano[c]chromenes. Results: The formation of carbon microsphere supported copper nanoparticles (Cu-NP/C) prepared from loaded cation exchange resin was confirmed by XRD, SEM and Raman spectroscopy which was employed as a heterogeneous material for the synthesis of 3,4-dihydropyrano[c]chromenes. The products formed were characterized by the analysis of spectroscopic data - NMR, IR and mass. The safe catalytic system offers several advantages including operational simplicity, environmental friendliness, high yield, and reusability of catalyst and green chemical transformation. Conclusion: Herein we report an easy and efficient protocol for the one-pot synthesis of dihydropyrano[ c]chromenes using environmentally benign MCR approach in ethanol as the green solvent. The method developed herein constitutes a valuable addition to the existing methods for the synthesis of titled compounds.

Sulfamic Acid-catalyzed One-pot Multicomponent Synthesis of 5-phenyl-2- thioxo-1,2,3,5-tetrahydro-4H-pyrimido[4,5-d][1,3]thiazolo[3,2-a]pyrimidin- 4-ones

2017 ◽  
Vol 3 (3) ◽  
pp. 227-234 ◽  
Author(s):  
Sunetra Jadhav ◽  
Ajinkya Patravale ◽  
Reshma Patil ◽  
Digambar Kumbhar ◽  
Vishram Karande ◽  
...  
Keyword(s):  
Sulfamic Acid ◽  
Multicomponent Synthesis ◽  
One Pot ◽  
Acid Catalyzed
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