Using Geminal Dicationic Ionic Liquids as Solvents for High-Temperature Organic Reactions

Several organic reactions conducted at high temperatures, including the isomerization reaction, the Claisen rearrangement, and the Diels−Alder reaction, were investigated in three geminal dicationic ionic liquids with high thermal stability. High to moderate yields of the products for most entries were obtained. Advantages of these approaches are discussed. These ionic liquids were shown to be recyclable. The utility of these ionic liquid solvents for high-temperature organic reactions was demonstrated.