The products obtained from reaction of ethyl acetoacetate with several (poly)ethyleneglycols undergo the Hantzsch condensation with ammonium carbonate and formaldehyde giving new crown ethers; transformations and properties of these new compounds are described.
T. J. van Bergen and R. M. Kellogg, J. Chem. Soc., Chem. Commun., 1976, 964 DOI: 10.1039/C39760000964
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