N-Ethyl(diethylphosphono)methylketen imine, a new type of keten imine, was easily prepared in high yield, and reacted with the sodium salts of salicylaldehyde and 2-formylpyrrole to afford the benzopyran and pyrrolizine derivatives, respectively.
J. Motoyoshiya, J. Enda, Y. Ohshiro and T. Agawa, J. Chem. Soc., Chem. Commun., 1979, 900 DOI: 10.1039/C39790000900
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