A comparative study of the catalytic activity of Co- and CoFe2O4-NPs in C–N and C–O bond formation: synthesis of benzimidazoles and benzoxazoles from o-haloanilides

2016 ◽  
Vol 40 (12) ◽  
pp. 10474-10481 ◽  
Author(s):  
Abdol R. Hajipour ◽  
Zahra Khorsandi
Keyword(s):  
Catalytic Activity ◽  
Comparative Study ◽  
Bond Formation ◽  
New Methods ◽  
Comparison Of The Results

Herein, new methods and a comparison of the results for dehalogenative intramolecular C–X bond formation using two inexpensive and efficient catalysts are reported.

The remarkable catalytic activity of ultra-small free-CeO2 nanoparticles in selective carbon–carbon bond formation reactions in water at room temperature

2015 ◽  
Vol 39 (7) ◽  
pp. 5350-5353 ◽  
Author(s):  
Subhash Banerjee
Keyword(s):  
Catalytic Activity ◽  
Room Temperature ◽  
Bond Formation ◽  
Ceo2 Nanoparticles ◽  
Cerium Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Reusable Catalyst ◽  
Carbon Carbon Bond ◽  
Active Methylene Compounds ◽  
Active Methylene

A simple and efficient protocol for selective bis-Michael addition and mono-allylation of active methylene compounds has been demonstrated using ultra-small size (∼5 nm) uncapped cerium oxide nanoparticles (free-CeO2 NPs) as a reusable catalyst in water at room temperature.

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 Role of C, S, Se and P donor ligands in copper(i) mediated C–N and C–Si bond formation reactions

RSC Advances ◽  
2018 ◽  
Vol 8 (56) ◽  
pp. 32269-32282 ◽  
Author(s):  
Katam Srinivas ◽  
Ganesan Prabusankar
Keyword(s):  
Comparative Study ◽  
Bond Formation ◽  
Donor Ligands ◽  
Bond Formation Reactions

The first comparative study of C, S, Se and P donor ligands-supported copper(i) complexes for C–N and C–Si bond formation reactions.

scholarly journals The hetero-Friedel-Crafts-Bradsher Cyclizations with Formation of Ring Carbon-Heteroatom (P, S) Bonds, Leading to Organic Functional Materials

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4751
Author(s):  
Joanna Skalik ◽  
Marek Koprowski ◽  
Ewa Różycka-Sokołowska ◽  
Piotr Bałczewski
Keyword(s):  
Flame Retardants ◽  
Bond Formation ◽  
Functional Materials ◽  
Semiconducting Materials ◽  
Conjugated Molecules ◽  
Comprehensive Review ◽  
Ring Carbon ◽  
New Methods ◽  
Cyclic Molecules ◽  
Methods Of Synthesis

The interest in functional materials possessing improved properties led to development of new methods of their synthesis, which allowed to obtain new molecular arrangements with carbon and heteroatom motifs. Two of the classical reactions of versatile use are the Friedel-Crafts and the Bradsher reactions, which in the new heteroatomic versions allow to replace ring carbon atoms by heteroatoms. In the present work, we review methods of synthesis of C–S and C–P bonds utilizing thia- and phospha-Friedel-Crafts-Bradsher cyclizations. Single examples of C–As and lack of C–Se bond formation, involving two of the closest neighbors of P and S in the periodic table, have also been noted. Applications of the obtained π-conjugated molecules, mainly as semiconducting materials, flame retardants, and resins hardeners, designed on the basis of five- and six-membered cyclic molecules containing ring phosphorus and sulfur atoms, are also included. This comprehensive review covers literature up to August 2020.

A Comparative Study of Sulfhydryl Groups Required for the Catalytic Activity of Gramicidin S Synthetase and Isoleucyl tRNA Synthetase

1984 ◽  
Vol 96 (3) ◽  
pp. 701-711 ◽  
Author(s):  
Masayuki KANDA ◽  
Kazuko HORI ◽  
Toshitsugu KUROTSU ◽  
Setsuko MIURA ◽  
Yoshitaka SAITO
Keyword(s):  
Catalytic Activity ◽  
Comparative Study ◽  
Trna Synthetase ◽  
Sulfhydryl Groups ◽  
Gramicidin S

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.

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