The Friedel-Crafts acylation of substituted benzenes proceeds smoothly by using a catalytic amount of a lanthanide trifluoromethanesulfonate [Ln(OTf)3], which is easily recovered from the reaction mixture and reused without a decrease in catalytic activity.
A. Kawada, S. Mitamura and S. Kobayashi, J. Chem. Soc., Chem. Commun., 1993, 1157 DOI: 10.1039/C39930001157
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