Efficient three-component coupling reactions catalyzed by Cu0-nanoparticles stabilized on modified montmorillonite

2014 ◽  
Vol 4 (4) ◽  
pp. 1047-1054 ◽  
Author(s):  
Bibek Jyoti Borah ◽  
Subrat Jyoti Borah ◽  
Lakshi Saikia ◽  
Dipak Kumar Dutta
Keyword(s):  
Catalytic Performance ◽  
Montmorillonite Clay ◽  
Environmentally Benign ◽  
Coupling Reactions ◽  
Modified Montmorillonite ◽  
Three Component Coupling

In situgeneration of Cu0-nanoparticles into the nanopores of environmentally benign modified montmorillonite clay and their catalytic performance in three component (A3) coupling reactions of aldehyde, amine and alkyne to synthesize propargylamines with excellent yields and selectivity.

Hierarchically porous covalent organic frameworks assembled in ionic liquids for highly effective catalysis of C–C coupling reactions

2020 ◽  
Vol 22 (8) ◽  
pp. 2605-2612 ◽  
Author(s):  
Jikuan Qiu ◽  
Huiyong Wang ◽  
Yuling Zhao ◽  
Pengxin Guan ◽  
Zhiyong Li ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Bond Formation ◽  
Catalytic Performance ◽  
Environmentally Benign ◽  
Coupling Reactions ◽  
Covalent Organic Frameworks ◽  
Hierarchically Porous ◽  
Highly Effective ◽  
Bond Formation Reactions

A simple and environmentally benign strategy was reported for the synthesis of hierarchically porous COFs in ionic liquids, and the obtained materials show highly effective catalytic performance for C–C bond formation reactions.

Nitrosonium-Mediated Phenol–Arene Cross-Coupling Involving Direct C–H Activation

2017 ◽  
Vol 70 (4) ◽  
pp. 407 ◽  
Author(s):  
Anna Eisenhofer ◽  
Uta Wille ◽  
Burkhard König
Keyword(s):  
Cross Coupling ◽  
Solvent System ◽  
Environmentally Benign ◽  
Lithium Nitrate ◽  
Coupling Reactions ◽  
Substituted Phenols ◽  
Cross Coupling Reactions ◽  
Inorganic Nitrate ◽  
Nitrosonium Ion

The nitrosonium ion (NO+) is a highly versatile nitration and nitrosation reagent, as well as a strong one-electron oxidant. Herein, we describe an environmentally benign and mild method for the in situ formation of NO+ from readily available inorganic nitrate salts, i.e. lithium nitrate, through a finely tuned interplay between formic acid and MeOH, which are used as the solvent system. This methodology was applied to the NO+-induced oxidative C–H activation of methoxy-substituted phenols, which are versatile lignin-derived aromatic feedstocks, to achieve C–C cross-coupling reactions with arenes. The regeneration of NO+ by atmospheric molecular oxygen enables substoichiometric use of the nitrate.

In situ synthesis of environmentally benign montmorillonite supported composites of Au/Ag nanoparticles and their catalytic activity in the reduction of p-nitrophenol

RSC Advances ◽  
2014 ◽  
Vol 4 (105) ◽  
pp. 61114-61123 ◽  
Author(s):  
Biswajoy Bagchi ◽  
Pradip Thakur ◽  
Arpan Kool ◽  
Sukhen Das ◽  
Papiya Nandy
Keyword(s):  
Catalytic Activity ◽  
Metal Nanoparticles ◽  
Ag Nanoparticles ◽  
In Situ Synthesis ◽  
Montmorillonite Clay ◽  
Environmentally Benign

Montmorillonite clay supported in situ synthesized metal nanoparticles with catalytic activity was provided.

Synthesis of environmentally benign ultra-small copper nanoclusters-halloysite composites and their catalytic performance on contrasting azo dyes

2021 ◽  
Vol 546 ◽  
pp. 149122
Author(s):  
Amal Kanti Deb ◽  
Bhabananda Biswas ◽  
Nirmal Goswami ◽  
Emily F. Hilder ◽  
Ravi Naidu ◽  
...  
Keyword(s):  
Azo Dyes ◽  
Catalytic Performance ◽  
Environmentally Benign ◽  
Copper Nanoclusters

scholarly journals Effect of Na- and Organo-Modified Montmorillonite/Essential Oil Nanohybrids on the Kinetics of the In Situ Radical Polymerization of Styrene

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 474
Author(s):  
Ioannis S. Tsagkalias ◽  
Alexandra Loukidi ◽  
Stella Chatzimichailidou ◽  
Constantinos E. Salmas ◽  
Aris E. Giannakas ◽  
...  
Keyword(s):  
Essential Oil ◽  
Radical Polymerization ◽  
Food Packaging ◽  
In Situ Polymerization ◽  
Average Molecular Weight ◽  
Monomer Conversion ◽  
Hydroxyl Groups ◽  
Modified Montmorillonite ◽  
Kinetics Of

The great concern about the use of hazardous additives in food packaging materials has shown the way to new bio-based materials, such as nanoclays incorporating bioactive essential oils (EO). One of the still unresolved issues is the proper incorporation of these materials into a polymeric matrix. The in situ polymerization seems to be a promising technique, not requiring high temperatures or toxic solvents. Therefore, in this study, the bulk radical polymerization of styrene was investigated in the presence of sodium montmorillonite (NaMMT) and organo-modified montmorillonite (orgMMT) including thyme (TO), oregano (OO), and basil (BO) essential oil. It was found that the hydroxyl groups present in the main ingredients of TO and OO may participate in side retardation reactions leading to lower polymerization rates (measured gravimetrically by the variation of monomer conversion with time) accompanied by higher polymer average molecular weight (measured via GPC). The use of BO did not seem to affect significantly the polymerization kinetics and polymer MWD. These results were verified from independent experiments using model compounds, thymol, carvacrol and estragol instead of the clays. Partially intercalated structures were revealed from XRD scans. The glass transition temperature (from DSC) and the thermal stability (from TGA) of the nanocomposites formed were slightly increased from 95 to 98 °C and from 435 to 445 °C, respectively. Finally, better dispersion was observed when orgMMT was added instead of NaMMT.

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