The stepwise insertion of three ethylidene units into the rings of 2-acetylcycloalk-2-enones or the corresponding lactones can be readily effected by the addition of diazoethane and the elimination of nitrogen.
F. M. Dean and B. K. Park, J. Chem. Soc., Chem. Commun., 1975, 142 DOI: 10.1039/C39750000142
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