Since the early 2000s, ionic liquids have become more and more popular in many fi elds of chemistry (Kadokawa 2013; Kokorin 2011; Plechkova and Seddon 2013; Wasserscheid and Welton 2008). Due to their rapid identifi cation as a new reaction environment, they can substitute volatile solvents. Some years before, the main innovation in this area had to do with water (see chapter in this book), perfl uorinated solvents or HMPT, a more outstanding solvent which appeared in the 60s. The physico-chemical properties of these solvents (dielectric constant, electric dipolar moment, hydrophobicity, etc.) initiate the reactivity and the special selectivity observed in these environments. Ionic liquids have gained rapidly in popularity among chemists and are subject to many international groups’ research. They are no longer considered only as solvents. The huge diversity of accessible molecules by simple and effective ways allows for the awarding of particular properties, making them technology liquids. Their uses are varied and range from batteries to additive painting. They are also used in solution supported chemistry.