مشخصات پژوهش

In this work, novel ionic liquid 1-sulfopyridinium chloride {[Pyridine–SO H]Cl} is synthesized, and characterized by IR, 1 H and 13 3 C NMR, UV as well as mass spectra. The ionic liquid is used as an ef?cient, homogeneous and reusable catalyst for the synthesis of 4,4 -(arylmethylene)-bis(3-methyl-1-phenyl-1Hpyrazol-5-ol)s by tandem Knoevenagel–Michael reaction of 3-methyl-1-phenyl-1H-pyrazol-5(4H)-one with various aromatic and hetero-aromatic aldehydes under mild reaction conditions.