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Knoevenagel Reaction Catalyzed by a Reusable Bronsted Acid Based on 1-Alkyl-1,2,4-triazolium Tetrafluoroborate

[ Vol. 15 , Issue. 2 ]

Author(s):

Elango Kandasamy*, Sankaranarayanan Nagarajan and Tanveer M. Shaikh*   Pages 133 - 138 ( 6 )

Abstract:


The Knoevenagel reaction is one of the most useful methods for the synthesis of α,β- unsaturated nitriles. We disclose an efficient protocol for the Knoevenagel reaction of aldehydes with malononitrile catalyzed by 1-alkyl-1,2,4-triazolium salts to afford the corresponding products in excellent yields. The important feature of this reaction is the catalyst; 1-alkyl-1,2,4-triazolium salts are recycled and reused. Furthermore, the reaction conditions are environment friendly and do not produce any hazardous waste.

Keywords:

Aldehyde, benzylidenemalononitrile, Brønsted acid, ionic liquids, Knoevenagel reaction, reusable catalyst, triazolium salts.

Affiliation:

Department of Sciences, Amrita School of Engineering Coimbatore, Amrita Vishwa Vidyapeetham, Amrita University, Coimbatore, Deapetment of S&H, PSN Engineering College, Melathediyoor, Tirunelveli, Department of Chemistry, CNCS, Mekelle University, Mekele

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