Solvent-free Carboxylation of Styrene Oxide: Enhanced Reactivity of Quaternary Onium Salts in Ionic Liquid-CO2 System

with epoxidesand still remains as attractive catalysts due to their usefulcatalytic properties such as easy availability, high chemicalstability against redox conditions and catalytic stability afteruse.Ionic liquids have received a lot of interest recentlybecause they possess some of the most important features,such as the negligible vapor pressure, unique solvationproperties, good ion conductivity as well as catalytic activityand selectivity.