K10 montmorillonite clays as environmentally benign catalysts for organic reactions

2014 ◽  
Vol 4 (8) ◽  
pp. 2378-2396 ◽  
Author(s):  
Basuvaraj Suresh Kumar ◽  
Amarajothi Dhakshinamoorthy ◽  
Kasi Pitchumani
Keyword(s):  
Catalytic Activity ◽  
Organic Reactions ◽  
Environmentally Benign ◽  
Montmorillonite Clays ◽  
Multifunctional Catalyst

This perspective summarizes the catalytic activity of K10 montmorillonite as a multifunctional catalyst for organic reactions.

scholarly journals Cu(II) and magnetite nanoparticles decorated melamine-functionalized chitosan: A synergistic multifunctional catalyst for sustainable cascade oxidation of benzyl alcohols/Knoevenagel condensation

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Zahra Alirezvani ◽  
Mohammad G. Dekamin ◽  
Ehsan Valiey
Keyword(s):  
Catalytic Activity ◽  
Knoevenagel Condensation ◽  
Ambient Pressure ◽  
Reaction Medium ◽  
Environmentally Benign ◽  
One Pot ◽  
Benzyl Alcohols ◽  
External Magnet ◽  
Multistep Synthesis ◽  
Multifunctional Catalyst

AbstractThe uniform decoration of Cu(II) species and magnetic nanoparticles on the melamine-functionalized chitosan afforded a new supramolecular biopolymeric nanocomposite (Cs-Pr-Me-Cu(II)-Fe3O4). The morphology, structure, and catalytic activity of the Cs-Pr-Me-Cu(II)-Fe3O4 nanocomposite have been systematically investigated. It was found that Cs-Pr-Me-Cu(II)-Fe3O4 nanocomposite can smoothly promote environmentally benign oxidation of different benzyl alcohol derivatives by tert-butyl hydroperoxide (TBHP) to their corresponding benzaldehydes and subsequent Knoevenagel condensation with malononitrile, as a multifunctional catalyst. Interestingly, Fe3O4 nanoparticles enhance the catalytic activity of Cu(II) species. The corresponding benzylidenemalononitriles were formed in high to excellent yields at ambient pressure and temperature. The heterogeneous Cs-Pr-Me-Cu(II)-Fe3O4 catalyst was also very stable with almost no leaching of the Cu(II) species into the reaction medium and could be easily recovered by an external magnet. The recycled Cs-Pr-Me-Cu(II)-Fe3O4 was reused at least four times with slight loss of its activity. This is a successful example of the combination of chemo- and bio-drived materials catalysis for mimicing biocatalysis as well as sustainable and one pot multistep synthesis.

ChemInform Abstract: K10 Montmorillonite Clays as Environmentally Benign Catalysts for Organic Reactions

ChemInform ◽  
2014 ◽  
Vol 45 (40) ◽  
pp. no-no ◽  
Author(s):  
Basuvaraj Suresh Kumar ◽  
Amarajothi Dhakshinamoorthy ◽  
Kasi Pitchumani
Keyword(s):  
Organic Reactions ◽  
Environmentally Benign ◽  
Montmorillonite Clays

scholarly journals Non-Enzymatic Desymmetrization Reactions in Aqueous Media

Symmetry ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 720
Author(s):  
Satomi Niwayama
Keyword(s):  
Natural Products ◽  
Total Synthesis ◽  
Functional Groups ◽  
Organic Compounds ◽  
Recent Progress ◽  
Aqueous Media ◽  
Building Blocks ◽  
Organic Reactions ◽  
Environmentally Benign ◽  
Enzymatic Desymmetrization

Symmetric organic compounds are generally obtained inexpensively, and therefore they can be attractive building blocks for the total synthesis of various pharmaceuticals and natural products. The drawback is that discriminating the identical functional groups in the symmetric compounds is difficult. Water is the most environmentally benign and inexpensive solvent. However, successful organic reactions in water are rather limited due to the hydrophobicity of organic compounds in general. Therefore, desymmetrization reactions in aqueous media are expected to offer versatile strategies for the synthesis of a variety of significant organic compounds. This review focuses on the recent progress of desymmetrization reactions of symmetric organic compounds in aqueous media without utilizing enzymes.

A facile approach to fabricate halloysite/metal nanocomposites with preformed and in situ synthesized metal nanoparticles: a comparative study of their enhanced catalytic activity

2015 ◽  
Vol 44 (19) ◽  
pp. 8906-8916 ◽  
Author(s):  
Sankar Das ◽  
Subhra Jana
Keyword(s):  
Catalytic Activity ◽  
Comparative Study ◽  
Metal Nanoparticles ◽  
Heterogeneous Catalysts ◽  
Cost Effective ◽  
Environmentally Benign ◽  
Metal Nanocomposites

Halloysite/metal nanocomposites have been synthesized through the immobilization of preformed and in situ synthesized metal nanoparticles over halloysite surfaces, which in turn produce efficient, cost-effective, and environmentally benign heterogeneous catalysts.

scholarly journals Hydrogenation of unactivated enamines to tertiary amines: rhodium complexes of fluorinated phosphines give marked improvements in catalytic activity

2015 ◽  
Vol 11 ◽  
pp. 622-627 ◽  
Author(s):  
Sergey Tin ◽  
Tamara Fanjul ◽  
Matthew L Clarke
Keyword(s):  
Catalytic Activity ◽  
Environmentally Benign ◽  
Acid Extraction ◽  
Rhodium Complexes ◽  
Tertiary Amines

In the hydrogenation of sluggish unactivated enamine substrates, Rh complexes of electron-deficient phosphines are demonstrated to be far more reactive catalysts than those derived from triphenylphosphine. These operate at low catalyst loadings (down to 0.01 mol %) and are able to reduce tetrasubstituted enamines. The use of the sustainable and environmentally benign solvent (R)-limonene for the reaction is also reported with the amine isolated by acid extraction.

Chitosan: A Natural and Sustainable Polymeric Organocatalyst for C-C Bond Formation During the Synthesis of 5-amino-2,3-dihydrobenzo[d] thiazole-4,6-dicarbonitriles

2019 ◽  
Vol 6 (1) ◽  
pp. 69-76
Author(s):  
Km N. Shivhare ◽  
Ibadur R. Siddiqui
Keyword(s):  
Catalytic Activity ◽  
Multicomponent Reaction ◽  
Bond Formation ◽  
Environmentally Benign ◽  
One Pot ◽  
Reaction Condition ◽  
Three Component Reaction ◽  
Efficient Route

Background: A green, recyclable and reusable chitosan catalyst has been utilized for the synthesis of 5-amino-2,3-dihydrobenzo[d]thiazole-4,6-dicarbonitrile and its derivatives. Methods and Results: Three-component reaction protocol incorporates the reaction of aldehydes, malononitrile and rhodanine derivatives. This is examined as an efficient route for the synthesis of dicarbonitriles utilizing a green, biodegradable, environmentally benign, and easily available chitosan catalyst. In the reported protocol, catalyst can be recycled and not any substantial dropping in its catalytic activity during the recycling steps was obtained. Conclusion: A green and environmentally benign, one pot three-component protocol has been illustrated for the synthesis of 5-amino-2,3-dihydrobenzo[d]thiazole-4,6-dicarbonitrile derivatives. Adequately yield products were gained via the natural catalytic approach with the recyclability of the catalyst. The use of chitosan represents this procedure as an attractive substitute for the synthesis of biaryls complex by multicomponent reaction condition.

Environmentally benign selective hydrogenation of α,β-unsaturated aldehydes and reduction of aromatic nitro compounds using Cu based bimetallic nanoparticles supported on multiwalled carbon nanotubes and mesoporous carbon

RSC Advances ◽  
2016 ◽  
Vol 6 (85) ◽  
pp. 82359-82369 ◽  
Author(s):  
H. N. Hareesh ◽  
K. U. Minchitha ◽  
K. Venkatesh ◽  
N. Nagaraju ◽  
N. Kathyayini
Keyword(s):  
Carbon Nanotubes ◽  
Catalytic Activity ◽  
Mesoporous Carbon ◽  
Bimetallic Nanoparticles ◽  
Nitro Compounds ◽  
Environmentally Benign ◽  
Multiwalled Carbon ◽  
Unsaturated Aldehydes ◽  
Aromatic Nitro Compounds ◽  
Aromatic Nitro

The catalytic activity of these materials was investigated in the hydrogenation of α,β-unsaturated aldehydes and reduction of aromatic nitro compounds using different hydrogen sources.

Synthesis of 5-Acetylacenaphthene Using Silica-Supported Phosphotungstic Heteropoly Acid as an Efficient and Reusable Catalyst

2012 ◽  
Vol 560-561 ◽  
pp. 214-220
Author(s):  
Ai Xia Pan ◽  
Yin Yin Wu ◽  
Yu Fang ◽  
Lu Lu Xu ◽  
Min Chen
Keyword(s):  
Catalytic Activity ◽  
1H Nmr ◽  
Nmr Spectra ◽  
Benzoyl Chloride ◽  
Heteropoly Acid ◽  
Environmentally Benign ◽  
Reusable Catalyst ◽  
Acylation Reaction ◽  
Experimental Parameters ◽  
Ft Ir

To obtain new fine chemical and intermediate of functional polymer material, the acylation of acenaphthene with benzoyl chloride to 5-acetylacenaphthene catalyzed by silica-supported phosphotungstic heteropoly acid (PW/SiO2) was investigated. Pure 5-acetylacenaphthene was obtained and its structure was identified by GC/MS, FT-IR and 1H NMR spectra. The effects of experimental parameters on the catalytic acylation reaction and the possibility of reusability of PW/SiO2 catalyst were studied. Under optimun conditions, the yield and the selectivity of 5-acetylacenaphthene were up to 81.3 % and 93.6 %, respectively. PW/SiO2 shows well catalytic activity after running for 5 times. The experimental results indicate that PW/SiO2 is a recyclable and environmentally benign catalyst in the synthesis of 5-acetylacenaphthene.

Sign in / Sign up

Export Citation Format

Share Document