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.
![15,17-dimethyl-3,6,9,12-tetraoxa-16-azabicyclo[12.3.1]octadeca-1(18),14,16-triene-2,13-dione结构式](https://image.chemsrc.com/caspic/451/62921-54-4.png)