Synthesis of 1-acetylpyrene via Friedel-Crafts Reaction Using Chloroaluminate Ionic Liquids as Dual Catalyst and Solvent

摘要

Acetylation of pyrene with acetyl chloride to 1-acetylpyrene catalyzed by chloroaluminate ionic liquids of different alkyl chain length and metal chloride was investigated. Pure 1-acetylpyrene was obtained and the structure of 1-acetylpyrene was identified by GC/MS, FT-IR and 1HNMR spectra.[Emim]Cl/AlCl_3([Emim]+=1-ethyl-3-met-hylimidazolium cation) ionic liquid was found to be the most active catalyst in the acylation. The yield of 1-acetylpyrene was up to 91.8% and the selectivity towards 1-acetylpyrene was up to 98.2%. The reusing experiment shows that [Emim]Cl-AlCl_3 can be used as both catalyst and solvent, and it is reusable and environmentally friendly for the preparation of 1-acetylpyrene.