Using Acidic Ionic Liquid 1-Butyl-3-methylimidazolium Hydrogen Sulfate in Selective Nitration of Phenols under Mild Conditions

Selective nitration of phenols with sodium nitrate was carried out in the presence of acidic ionic liquid 1-butyl-3-methylimidazolium hydrogen sulfate at room temperature in good to high yields and short reaction times. The use of inexpensive and relatively non toxic acidic reagent is an advantage of this method.