Published Online: 15 APR 2007
Copyright © 2002 by Wiley-VCH Verlag GmbH & Co. KGaA
Ullmann's Encyclopedia of Industrial Chemistry
How to Cite
Weber, E. 2007. Crown Ethers. Ullmann's Encyclopedia of Industrial Chemistry. .
- Published Online: 15 APR 2007
The article contains sections titled:
|1.||Classification and Nomenclature|
|4.||Crown Ether Complexes|
|7.||Toxicology and Occupational Health|
Crown ethers belong to the general group of macrocyclic polyethers. The name crown ethers refers to the crown-like atomic arrangement. The most remarkable property of crown ethers is their ability to yield stable complexes with alkali and alkaline-earth metal ions and ammonium ions. Crown ethers may also act as “second-sphere ligands” of metal ion complexes. Under optimized conditions, crown ethers can be used effectively for ion extractions, but other important uses are, for example, as complexing agents and phase-transfer catalysts in organic syntheses. Besides the characteristics and uses of crown ethers, their production processes and toxicological features are addressed as well.