Imidazolium-Based Phosphinite Ionic Liquid (IL-OPPh2) as Reusable Catalyst and Solvent for the Knoevenagel Condensation Reaction |
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| Authors: | Hassan Valizadeh Hamid Gholipour |
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| Affiliation: | 1. Department of Chemistry, Faculty of Sciences , Azarbaijan University of Tarbiat Moallem , Tabriz, Iran h-valizadeh@azaruniv.edu;3. Department of Chemistry, Faculty of Sciences , Azarbaijan University of Tarbiat Moallem , Tabriz, Iran |
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| Abstract: | A task-specific ionic liquid (IL, OPPh2) that bears a phosphinite weak Lewis base group in an imidazolium cation was found to efficiently catalyze the Knoevenagel condensation of arylaldehydes with malononitrile, dimethyl(diethyl)malonate, and ethyl cyanoacetate. This IL plays a dual role as both the reaction media and also catalyst, and it can be easily recovered and reused in several runs. Satisfactory results were obtained with good yields, short reaction time, and simplicity in the experimental procedure. A variety of coumarin derivatives were synthesized in this procedure. |
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| Keywords: | Coumarin ionic liquid Knoevenagel task-specific |
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