The acid-catalysed decomposition of the un-saturated diazomethyl ketones (1–3) leads to the cyclo-pentenone derivatives (4–6), respectively; this reaction, in conjuction with the Reformatsky addition-dehydra-tion sequence, leading to βγ-unsaturated acids, repre-sents a new cyclopentenone annelation scheme.
A. B. Smith, J. Chem. Soc., Chem. Commun., 1975, 274 DOI: 10.1039/C39750000274
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