Deep Eutectic Solvents as Catalysts Solvents for Organic Reactions

Abstract

Global warming issue is raising more concern in favour of newlineintroducing new green methods in chemistry. Greener chemical reactions newlinecan overcome most of the problems associated with environment along newlinewith high productivity. Easy recyclable approaches used in green chemistry newlineare utilization of supercritical fluids (eg. sc CO2), water, fluorous solvents, newlinepolyethylene glycol (PEG), solvent free condition, glycerol, liquid polymers, newlineroom temperature ionic liquids, deep eutectic solvents (DESs) etc. Among newlinethese, DESs are the most recent ones introduced in 2001. This methodology newlinefor organic synthesis has obtained major attention due to the serious newlinedamage of environment by the use of hazardous chemicals in industries. newlineThis is based on the green aspects of sustainable chemical transformations newlinelike atom economy, free from using organic solvents, energy efficiency newlineetc. Deep eutectic solvent is actually a makeover of ionic liquids with newlineadditional advantages, but cannot be considered as conventional ILs; newlinesome of their components are uncharged. The main highlights of DESs newlineare their smooth preparation methods and recycling process; they are newlineformed by mixing two components with gentle heating and the DESs are newlineformed with much lower melting point than the individual components. newlineThey are also called designer solvents or tailor made solvents because their newlineproperties can be designed by changing the constituents used and are good newlinealternatives to traditional organic solvents. Influence of strong hydrogen newlinebond donors (HBDs) on the physical properties like density, viscosity, newlineacidity, conductivity, of DESs is reported and is very significant in tailoring newlineDESs for specific purposes. newline