Methyl crepenynate has been synthesised from non-3-yn-1-yl-triphenylphosphonium bromide (obtained from hept-1-yne via non-3-yn-1-ol and 1-bromonon-3-yne) and the C9 aldehyde-ester with butyl-lithiumin ether, and from it crepenynic acid was obtained by alkaline hydrolysis.
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Bradshaw et al. (1971) studied this question.
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