An efficient synthesis of methyl (±)‐jasmonate and (Z)‐jasmone is described. The Key step is a phase‐transfer reaction between cyclopentane (9) and 1, 4‐dibromo‐2‐pentene (6a/b) to give the spiro [2.4]hepten‐4‐ones 4a and 4b.
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Näf et al. (1978) studied this question.
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