Sodium Carboxymethylcellulose: A Low-Cost and Renewable Catalyst for Solvent-Free Knoevenagel Condensation Reaction at Room Temperature

2018 ◽  
Vol 3 (39) ◽  
pp. 11110-11117 ◽  
Author(s):  
Hao Ma ◽  
Lianning Zou ◽  
Linhan Mi ◽  
Haiting Pan ◽  
Yanhui Qiao ◽  
...  
Keyword(s):  
Room Temperature ◽  
Knoevenagel Condensation ◽  
Low Cost ◽  
Condensation Reaction ◽  
Solvent Free ◽  
Sodium Carboxymethylcellulose ◽  
Knoevenagel Condensation Reaction

Two new calix[4]resorcinarene-based coordination cages adjusted by metal ions for the Knoevenagel condensation reaction

2021 ◽  
Author(s):  
Wen-Yuan Pei ◽  
Bing-Bing Lu ◽  
Jin Yang ◽  
Tianqi Wang ◽  
Jian-Fang Ma
Keyword(s):  
Metal Ions ◽  
Knoevenagel Condensation ◽  
Condensation Reaction ◽  
Solvent Free ◽  
Catalytic Activities ◽  
Solvent Free Conditions ◽  
Coordination Cages ◽  
Knoevenagel Condensation Reaction

Two new calix[4]resorcinarene-based metal-coordinated cages have been synthesized through tuning metal ions, where they featured catalytic activities for the Knoevenagel condensation reaction under solvent-free conditions.

Agro-waste sourced catalyst as an eco-friendly and sustainable approach for Knoevenagel condensation reaction

2021 ◽  
Vol 09 ◽  
Author(s):  
Krishnappa B Badiger ◽  
Santosh Y Khatavi ◽  
Prashant B Hiremath ◽  
Kantharaju Kamanna
Keyword(s):  
Reaction Time ◽  
Microwave Irradiation ◽  
Knoevenagel Condensation ◽  
Condensation Reaction ◽  
Ethyl Cyanoacetate ◽  
Solvent Free ◽  
Present Approach ◽  
Irradiation Condition ◽  
Coumarin Derivatives ◽  
Knoevenagel Condensation Reaction

Background: The present work describes an eco-friendly and sustainable approach for the Knoevenagel condensation of an aromatic aldehyde with ethyl cyanoacetate, and salicylaldehyde with Meldrum acid for the synthesis of ethyl benzylidenecyanoacetate and 3-carboxy coumarin (2-oxo-2H-1-benzopyran) derivatives, respectively. The reaction performed under greener catalytic media Water Extract of Watermelon Fruit Peel Ash (WEWFPA) is an eco-friendly protocol derived from the agro-waste feedstock. Various protocols have been reported for the synthesis of Knoevenagel condensation reaction using a hazardous catalyst or/and solvent found toxic to the environment, reaction time longer, poor yield, and required purification of the final product. The present method provides several added advantages of being completely greener, economic, giving high yield, inexpensive catalyst, and the final product isolated in pure form with good yield. Objective: The objective of the study was to develop a green methodology for the synthesis of ethyl benzylidenecyanoacetate and 3-carboxy coumarin derivatives. Results: The agro-waste based catalyst developed avoids the use of external inorganic/organic base, additives, and solvent-free synthesis of Knoevenagel condensation of ethyl benzylidenecyanoacetate and 3-carboxy coumarin derivatives under rt and microwave irradiation, respectively described. The microwave irradiation condition requires less time for the completion of the reaction and also gave better yield isolation Methods: We have demonstrated WEWFPA as a greener homogenous agro-waste is employed under rt stirring and microwave irradiation for the economic synthesis of ethyl benzylidenecyanoacetate and 3-carboxy coumarin derivatives. The developed method was found robust, non-hazardous and solvent-free with simple work-up gave target product. Conclusion: In conclusion, we have established an efficient, simple, agro-waste based catalytic approach for the synthesis of ethylbenzylidenecyanoacetate and 3-carboxy coumarin derivatives employing WEWFPA as an efficient catalyst under rt stirring and microwave synthesis, respectively. The method is a greener, economical and eco-friendly approach for the synthesis of Knoevenagel condensation products. The advantages of the present approach are solvent-free, no external metal, chemical base free, short reaction time and isolated product in good to excellent yields. The catalyst is agro-waste derived, which has abundant in natural sources, thus making the present approach a greener one.

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