Acylation of Ferrocene and a 1,1′‐Diphosphaferrocene with Acyl Trifluoroacetates in the Presence of Trifluoromethanesulfonic (Triflic) Acid or Some Metal Triflates

Abstract

Ferrocene and 3,3′,4,4′‐tetramethyl‐1,1′‐diphosphaferrocene undergo efficient acylation by acyl trifluoroacetates (prepared in situ from carboxylic acids and trifluoroacetic anhydride) in the presence of an excess of trifluoromethanesulfonic acid or catalytic amounts (10% mol.) of its ytterbium or hafnium salts.

Keywords:

• Ferrocene
• Friedel–Crafts acylation
• Triflic acid
• Metal triflate
• 1,1′‐Diphosphaferrocene

Acknowledgment

We thank University of Lodz for financial support of this work (Grant 505/471).