Acetic trifluoromethanesulphonic anhydride is an ambident base which is protonated on either the carbonyl group or on the sulphonyl oxygen atom; it dissociates in very strong acid media to form the acetylium ion.
A. Germain and A. Commeyras, J. Chem. Soc., Chem. Commun., 1972, 1345b DOI: 10.1039/C3972001345B
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