Regioselectivity for Nitrochlorobenzene Preparation Over Imidazolium Ionic Liquids Media Using Nitric Acid

Abstract

Nitrochlorobenzene could be regioselective prepared over imidazolium ionic liquids media by using nitric acid as nitrating agents. A variety of ionic liquids, [Hmim]HSO₄, [Hmim]NO₃ and [Hmim]CF₃COO were prepared for the improvement of mononitrochlobenzene isomers. It was found that a high para isomer was achieved when employing [Hmim]HSO₄. Ionic liquids could be conveniently reused for five times by filtration with excellent yield of mono-nitration products and para-selectivity.