SCHEDULED MAINTENANCE
Derivatives of macrocyclic crown ethers in which two ethereal oxygen atoms have been replaced by carbonyl groups have been synthesised by the bis-(acetylacetonato) copper-catalysed cyclisation of αω-bis-diazo-ketones with polyethylene glycols; three such oxo-crown ethers complex with potassium ion in chloroform.
S. Kulkowit and M. A. McKervey, J. Chem. Soc., Chem. Commun., 1981, 616 DOI: 10.1039/C39810000616
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