Abstract
AbstractA new series of –SO3H functionalized dicationic ionic liquids based on N, N, N′, N′ ‐ tetrasulfopiperazinium cation [TSPi]+ and various anions [X]− (X=Cl, CF3SO3, TsO) is synthesized and characterized by 1H NMR, 13C NMR, FTIR, elemental analysis and thermogravimetric studies. Brönsted acidity of these ionic liquids is determined by Hammett plot using UV‐Visible absorbance spectra. Further they are examined as acidic catalyst for one‐pot preparation of 2‐amino‐4, 6‐diaryl pyrimidines through Biginelli‐like reaction of acetophenone, aromatic aldehyde and urea followed by condensation‐aromatization reaction with phenylhydrazine under solvent‐free grinding method. The most acidic [TSPi][CF3SO3]2 catalyst offers good to satisfactory yield within 15–25 min reaction time. Easy recyclability, simple and mild reaction conditions represent the advantages of this method.
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