Tertiary carboxamides are acylated at the oxygen atom by benzoyl or acetyl chloride in the presence of silver trifluoromethanesulphonate; if the resulting 1-acyloxyiminium salts contain hydrogen atoms at positions 2 or 4 they can be deprotonated to yield unstable 1-acyloxy-enamines or -dienamines, which have been trapped by reaction with 4-phenyl-1,2,4-triazoline-3,5-dione.
W. E. Bottomley and G. V. Boyd, J. Chem. Soc., Chem. Commun., 1980, 790 DOI: 10.1039/C39800000790
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