Synthesis of macrocyclic oxo-crown ethers from αω-bis-diazo-ketones and polyethylene glycols

Abstract
Derivatives of macrocyclic crown ethers in which two ethereal oxygen atoms have been replaced by carbonyl groups have been synthesised by the bis-(acetylacetonato) copper-catalysed cyclisation of αω-bis-diazo-ketones with polyethylene glycols; three such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.

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