Activity of Imidazolium-Based Ionic Liquids as Catalysts for Friedel-Crafts Acylation of Aromatic Compounds

摘要

Friedel-Crafts acylation of three aromatic compounds with acetyl chloride catalyzed by two kinds of ionic liquids was investigated. The imidazolium-based ionic liquids showed both high activity and high selectivity for this reaction. In particular, the catalytic effect of imidazolium-based ionic liquids was dramatically enhanced for ionic liquids containing the BF_4~- and Br~- anions. The effects of various types of anion, ionic liquid dosage, reaction temperature and time were explored using [Bmim]BF4 or [Bmim]Br as catalyst. Results show thai ionic liquids can be used as both catalyst and solvent.