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.
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Li et al. (2005) studied this question.
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