Abstract
Polystyrene-supported 1-methylimidazolium tetrachloroferrate (PS[mim][FeCl 4 ]) was prepared and characterized by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDX). The catalytic activity of the heterogeneous catalyst was evaluated through one-pot synthesis of 2-amino-4 H -chromene-3-carbonitriles via the three-component condensation reaction of aromatic aldehydes, malononitrile and dimedone or 2-naphthol in water. The heterogeneous catalyst could be recovered easily and reused five times without significant loss of its catalytic activity. KEY WORDS : Green chemistry, Heterogeneous catalyst, 4 H -chromene derivatives, Multi-component reactions, One-pot synthesis Bull. Chem. Soc. Ethiop. 2018 , 32(3), 531-540. DOI: https://dx.doi.org/10.4314/bcse.v32i3.12
Highlights
The use of water as solvent for organic reactions is one of the best solutions to the problem of flammability, volatility, toxicity and disposal of organic solvents [1]
Both homogeneous and heterogeneous phase-transfer catalysts improve the intimate contact between inorganic reagents and organic substrates, but one of the major problems associated with the use of homogeneous catalysts is the recovery of the catalyst from the reaction medium
Owing to the widespread applications of the described compounds, and in continuation of our efforts on the synthesis of new heterogeneous catalysts [24,25,26,27,28], in this paper, we report our study on synthesis, characterization, and catalytic properties of polystyrene-supported 1methylimidazolium tetrachloroferrate (PS[mim][FeCl4])
Summary
The use of water as solvent for organic reactions is one of the best solutions to the problem of flammability, volatility, toxicity and disposal of organic solvents [1]. Many reported methods for the synthesis of these compounds suffer from disadvantages including relying on multi-step conditions, need for excessive amounts of the reagents, the use of toxic organic solvents or catalysts, harsh reaction conditions, tedious work-up procedure, long reaction times, low yields of products and non-recyclability of the catalyst. Owing to the widespread applications of the described compounds, and in continuation of our efforts on the synthesis of new heterogeneous catalysts [24,25,26,27,28], in this paper, we report our study on synthesis, characterization, and catalytic properties of polystyrene-supported 1methylimidazolium tetrachloroferrate (PS[mim][FeCl4]).
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