The remarkable ease with which 1,3-diethoxycarbonylallene (1) undergoes cycloaddition with furans and pyrroles, and the ability of this reagent to serve as an ethoxycarbonylketen equivalent are described.
A. P. Kozikowski, W. C. Floyd and M. P. Kuniak, J. Chem. Soc., Chem. Commun., 1977, 582 DOI: 10.1039/C39770000582
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