Choline Chloride and Urea Based Eutectic Solvents: Effective Catalytic Systems for the Knoevenagel Condensation Reactions of Substituted Acetonitriles

2014 ◽  
Vol 38 (3) ◽  
pp. 186-188 ◽  
Author(s):  
Shuo Liu ◽  
Yuxiang Ni ◽  
Wenjing Wei ◽  
Fangli Qiu ◽  
Songlin Xu ◽  
...  
Keyword(s):  
Knoevenagel Condensation ◽  
Choline Chloride ◽  
Catalytic Systems ◽  
Condensation Reactions

Knoevenagel Condensation Reactions of Cyano Malononitrile-Derivatives Under Microwave Radiation

2018 ◽  
Vol 22 (6) ◽  
pp. 519-532 ◽  
Author(s):  
Lucas Lima Zanin ◽  
David Esteban Quintero Jimenez ◽  
Luis Pina Fonseca ◽  
Andre Luiz Meleiro Porto
Keyword(s):  
Microwave Radiation ◽  
Knoevenagel Condensation ◽  
Condensation Reactions

Green Synthesis of 2-thioxothiazolidin-4-one Derivatives in Deep Eutectic Solvents via Knoevenagel Condensation

2022 ◽  
Vol 19 ◽  
Author(s):  
Melita Lončarić ◽  
MAJA MOLNAR
Keyword(s):  
Chemical Synthesis ◽  
Green Synthesis ◽  
Environmental Pollution ◽  
Knoevenagel Condensation ◽  
Choline Chloride ◽  
Deep Eutectic Solvents ◽  
Model Reaction ◽  
Methods And Techniques ◽  
New Generation ◽  
Toxic Organic Solvents

Abstract: Recently, more and more researchers are resorting to green methods and techniques to avoid environmental pollution. Accordingly, many researchers have been working on the development of new green synthetic procedures trying to avoid the use of toxic organic solvents. A sustainable concept of green and environmentally friendly solvents in chemical synthesis nowadays encompasses a relatively new generation of solvents called deep eutectic solvents (DESs). DESs often have a dual role in the synthesis, acting as both, solvents and catalysts. In this study, DESs are used in the Knoevenagel synthesis of rhodanine derivatives, with no addition of conventional catalysts. A model reaction of rhodanine and salicylaldehyde was performed in 20 different DESs at 80 °C, in order to find the best solvent, which was further used for the synthesis of the series of desired compounds. A series of rhodanines was synthesized in choline chloride: acetamide (ChCl:acetamide) DES with good to excellent yields (51.4 – 99.7 %).

Dithienosilole extended BODIPYs: Synthesis and spectroscopic properties

2019 ◽  
Vol 23 (06) ◽  
pp. 664-670 ◽  
Author(s):  
Yijuan Sun ◽  
Lizhi Gai ◽  
Yitong Wang ◽  
Zhirong Qu ◽  
Hua Lu
Keyword(s):  
Absorption Coefficient ◽  
Dft Calculations ◽  
Knoevenagel Condensation ◽  
Spectroscopic Properties ◽  
Condensation Reactions ◽  
Spectral Bands ◽  
Spectral Shifts ◽  
Td Dft

3,/3,5-Dithienosilole-vinyl-BODIPYs were readily synthesized through Knoevenagel condensation reactions. Spectroscopic properties of two dyes in various solvents were investigated. Dyes 1 and 2 show an absorption maxima at 620 and 738 nm with absorption coefficient of 60900 and 77900 [Formula: see text] cm[Formula: see text] in DCM, respectively. Significant red shifts of the main spectral bands are observed relative to that of the parent 1,3,5,7-tetramethyl-BODIPY. TD-DFT calculations reproduce the spectral shifts and experimental spectra.

Fluorous bispidine: a bifunctional reagent for copper-catalyzed oxidation and knoevenagel condensation reactions in water

RSC Advances ◽  
2015 ◽  
Vol 5 (99) ◽  
pp. 81415-81428 ◽  
Author(s):  
Wei Jie Ang ◽  
Yong Sheng Chng ◽  
Yulin Lam
Keyword(s):  
Knoevenagel Condensation ◽  
Aerobic Oxidation ◽  
Mild Conditions ◽  
Condensation Reactions ◽  
Catalyzed Oxidation

Fluorous bispidine-type ligands have been developed to demonstrate its bifunctional property as a ligand and base in copper-catalyzed aerobic oxidation, the Knoevenagel condensation and tandem oxidation/condensation in water under mild conditions.

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