Isomerisation of prop-2-ynylic esters into 1,2- and 1,3-dienyl esters

Abstract
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.

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