By treatment with ButOK in Me2SO, carbocyclic β-keto-esters (5-,6-, and 7-membered rings) with a 4-oxopentyl function at the α-position afforded three-carbon ring expansion products (8-, 9-, and 10-membered rings, respectively).
Z. Xie, H. Suemune and K. Sakai, J. Chem. Soc., Chem. Commun., 1988, 612 DOI: 10.1039/C39880000612
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