Friedel-Crafts acylation of ferrocene catalyzed by immobilized ytterbium(III) triflate in ionic liquid

摘要

Ytterbium triflate [Yb(OTf)(3)]-catalyzed Friedel-Crafts acylation of ferrocene with anhydrides or acyl chlorides in n-butylpyridinium tetrafluoroborate (BPyBF4) ionic liquid proceeded smoothly under mild conditions. The immobilized catalytic system (solvent/catalyst) was easily recovered and reused without any loss of activity. Chemoselective monoacylferrocenes were obtained in high yields by this catalytic system.