Abstract
Reaction of cuprates derived from R 3MgBr/CuI/LiBr (R 3 = n-alkyl) with R 1C CCH(O 2CR 2) 2 (R 1 = sp 2 hybridised substituent, R 2 = mainly Me, alkyl, Ph) provides access to allenyl esters R 1R 3C C CH(O 2CR 2) (51–88%). Such species are not accessible via rearrangement of precursor propargylic R 1R 3C(O 2CR 2)C CH.
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