Brφnsted Acidic Ionic Liquids: Efficient and Recyclable Catalytic Systems for Beckmann Rearrangement

摘要

Six Brφnsted acidic ionic liquids(ILs)1a-1f were synthesized and used as the dual solvent-catalyst systems for Beckmann rearrangement reactions.Among ILs 1a-1f,IL 1a exhibited the highest catalytic activity and successfully catalyzed the Beckmann rearrangement of ketoximes,and the corresponding amides were obtained in good to excellent yields(74%-92%),In addition,IL 1a could be recovered easily and reused at least three times without any loss of catalytic activity.