Conventional Method: Reflux in Ethanol (68-75% in 14-15 h) CH COONH 3 4 Ar Ar N + N BF 3 15 mmol % NH [BMIM] [BF ] 5(a-k) Green Method MW at 240 W Solvent Free (84-89% in10-12 min) Keywords 1,3-Diphenyl-1H-pyrazole-4-carbaldehyde Microwave irradiation Solvent free Imidazole [BMIM][BF ] Abbreviations MW Microwave ILs Ionic liquids NR No reaction p-TSA p-Toluene sulfonic acid [BMIM][BF ] 1-Butyl-3-methyl-1-imidazolium tetraﬂuoroborate Introduction Ionic liquids (ILs) enable excellent and environmentally benign techniques for synthetic chemistry. ILs have been used as effective reaction media for a wide range of organic transformations and other applications [1–5]. ILs are salts that exist in liquid form, hence being used as catalysts as well as solvents in organic transformations . ILs possess many important properties such as thermal and chemical stability, low vapor pressure, ability to act as catalysts, nonﬂammability, and noncorrosive nature. These properties of ILs minimize hazards and solvent loss 123 Brønsted-acidic ionic liquid: green protocol for… 1091 to atmosphere. ILs are polar in nature, making them useful to carry out solvent-free reactions . Literature survey reveals that ILs are used in diverse organic transformations. Some important example ILs include 3-methyl-1-(4-sulfonic acid)-butylimida- zolium hydrogen sulfate ([(CH
Research on Chemical Intermediates – Springer Journals
Published: Aug 18, 2016
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