Title Piperazinium Dihydrogen Sulfate: an Acidic Ionic Liquid for the [3 2] Cycloaddition Reaction of Sodium Azide with Organic Nitriles Type Article Keywords Not Record Abstract Piperazinium dihydrogen sulfate:as a new acidic ionic compound was obtained by treatment of piperazine with sulfuric acid, which is further was applied as a catalyst for the [3 2] cycloaddition reaction of azides to organic nitriles. Researchers Najmeh Nowrouzi (First researcher) ,