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...ld conditions, compared to the [[potassium tert-butoxide]]/[[18-Crown-6|18-crown-6]] system with only 75% yield.<ref>{{citation |author=R. Schwesinger |auth [[Intramolecular cyclization]] of ''ortho''-alkynylphenyl ethers leads in the presence of P₄-''t''-Bu under mild conditions witho ...

...s inserted when a complex is formed. For example, the [[crown ether]] [[18-crown-6]] forms much stronger complexes with the [[potassium]] ion, K⁺ |[[File:Various crown ethers (molecular diagrams).png|700px]] ...

...hesis of poly(amide crown ethers) based on bis(5-carboxy-1,3-phenylene)-32-crown-10. Network formation through threading|journal=Macromolecules | volume=25| ...