Protic Acid Immobilized on Solid Support as an Extremely Efficient Recyclable Catalyst System for a Direct and Atom Economical Esterification of Carboxylic Acids with Alcohols

2009 ◽  
Vol 74 (16) ◽  
pp. 5967-5974 ◽  
Author(s):  
Asit K. Chakraborti ◽  
Bavneet Singh ◽  
Sunay V. Chankeshwara ◽  
Alpesh R. Patel
Keyword(s):  
Carboxylic Acids ◽  
Catalyst System ◽  
Solid Support ◽  
Recyclable Catalyst

Direct amidation of carboxylic acids with amines under microwave irradiation using silica gel as a solid support

2015 ◽  
Vol 17 (5) ◽  
pp. 3157-3163 ◽  
Author(s):  
Andrea Ojeda-Porras ◽  
Alejandra Hernández-Santana ◽  
Diego Gamba-Sánchez
Keyword(s):  
Fatty Acids ◽  
Microwave Irradiation ◽  
Carboxylic Acids ◽  
Silica Gel ◽  
Solid Support ◽  
Secondary Amines ◽  
Primary And Secondary Amines ◽  
Direct Amidation

A highly improved methodology for the direct amidation of carboxylic acids with amines using silica gel as a solid support and catalyst is described. Several examples using aliphatic, aromatic, unsaturated and fatty acids combined with primary and secondary amines are shown.

A cyclometalated Ir(iii)–NHC complex as a recyclable catalyst for acceptorless dehydrogenation of alcohols to carboxylic acids

2020 ◽  
Vol 49 (46) ◽  
pp. 16866-16876
Author(s):  
Dhrubajit Borah ◽  
Biswajit Saha ◽  
Bipul Sarma ◽  
Pankaj Das
Keyword(s):  
Carboxylic Acids ◽  
Recyclable Catalyst

The first example of delineating the efficacy of cyclometalated Ir NHC complexes in acceptorless dehydrogenation of alcohols to acids reported.

Ag/CdS Nanocomposite: An Efficient Recyclable Catalyst for the Synthesis of Novel 8-Aryl-8H-[1,3]dioxolo[4,5-g]chromene-6-carboxylic Acids under Mild Reaction Conditions

2018 ◽  
Vol 21 (5) ◽  
pp. 323-328 ◽  
Author(s):  
Shahrzad Abdolmohammadi ◽  
Seyed Reza Rasouli Nasrabadi ◽  
Ahmad Seif ◽  
Narges Elmi Fard
Keyword(s):  
Carboxylic Acids ◽  
Condensation Reaction ◽  
Sol Gel ◽  
Aqueous Media ◽  
Chemical Properties ◽  
Catalytic Amount ◽  
13C Nmr Spectroscopy ◽  
Biological Properties ◽  
Recyclable Catalyst ◽  
Reaction Conditions

Aim and Objective: Chromene derivatives are privileged heterocyclic systems that exhibit various types of biological properties such as antioxidant, anticancer, antimicrobial, hypotensive, and local anesthetic. Cadmium sulfide nanoparticles (CdS NPs) as an efficient heterogeneous catalyst is used in various organic transformations because of its certain unique and unusual physico-chemical properties. The effectiveness of catalytic activity of CdS NPs can be improved due to the combined effect of Ag particles. Results: Ag/CdS nanocomposite is a readily available, recyclable, and non-toxic catalyst used for the highly efficient synthesis of novel 8-aryl-8H-[1,3]dioxolo[4,5-g]chromrne-6-carboxylic acids. This reaction is conveniently performed under mild reaction conditions. All synthesized compounds were well characterized by their satisfactory elemental analyses, IR, 1H and 13C NMR spectroscopy. The synthesized catalyst was fully characterized by XRD, SEM, and EDX techniques. Materials and Methods: The present methodology focuses on the condensation reaction of arylmethylidenepyruvic acids with 3,4-methylenedioxyphenol, using a catalytic amount of Ag/CdS nanocomposite (15 mol%) in aqueous media at room temperature to afford 8-aryl-8H-[1,3]dioxolo [4,5-g]chromrne-6-carboxylic acids in high yields (90-97%) within short reaction times (2-4 h). The Ag/CdS nanocomposite was also prepared by an ultrasonic-assisted sol-gel method. Conclusion: In conclusion, we have successfully synthesized novel 8-aryl-8H-[1,3]dioxolo[4,5- g]chromrne-6-carboxylic acid derivatives by the Ag/CdS nanocomposite catalyzed cyclocondensation reaction of arylmethylidenepyruvic acids with 3,4-methylenedioxyphenol under mild reaction conditions. Environmentally benign procedure, high to excellent yields of products, simplicity of operation, and use of readily available and recyclable catalyst are the advantages of this new practical reaction.

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