Abstract
AbstractIn this work, a new nitrogen and sulfur based di‐cationic ionic liquid (IL), named 1,4‐piperazinium hydrogen sulfate ([H‐pi]HSO4), was simply synthesized from the reaction of piperazine with sulfuric acid, and then characterized with a variety of techniques, including Infrared (IR) and Nuclear Magnetic Resonance (NMR) spectroscopies, Thermo‐gravimetric analysis (TGA), Scanning Electron Microscope (SEM), and pH analysis. This new ionic liquid was employed as an efficient catalyst for the synthesis of 2,2′‐arylmethylene‐bis(3‐hydroxy‐5,5‐dimethyl‐2‐cyclohexene‐1‐one) and 1,8‐dioxooctahydroxanthene derivatives in C2H5OH:H2O media and under solvent‐free conditions, respectively. Also, this adequate catalyst was employed for the synthesis of imidazo[1,2‐a]pyrimidines and triazolo[4,3‐a]pyrimidinesviathree‐component reaction of aldehydes, malononitrile and 2‐aminobenzimidazole and/or 3‐amino[1,2,4]triazole. The new functionally‐structured products, synthesized through these methods, were characterized with IR,1H NMR,13C NMR and mass spectroscopy. Moreover, the procedures gave the products in good yields and short reaction times as well as reusability of the catalyst.
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