While the prop-2-ynyl acetates (1) rearrange to the allenyl acetates (2) in boiling benzene containing copper(I) chloride, in the presence of silver trifluoroacetate the butadienyl acetates (3), useful in Diels–Alder reactions, are formed in high yield.
R. C. Cookson, M. C. Cramp and P. J. Parsons, J. Chem. Soc., Chem. Commun., 1980, 197 DOI: 10.1039/C39800000197
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