SCHEDULED MAINTENANCE
A four-carbon ring expansion is presented which involves reaction of enamines of cyclic ketones with methyl propiolate followed by reaction of the resulting cis,cis-cycloalkadienes, also containing an ‘enamine’ type of double bond, with dimethyl acetylenediacarboxylate (DMAD).
G. J. M. Vos, D. N. Reinhoudt, P. H. Benders, S. Harkema and G. J. van Hummel, J. Chem. Soc., Chem. Commun., 1985, 661 DOI: 10.1039/C39850000661
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