Any of a class of organic compounds whose molecules are large rings containing a number of ether linkages.
〔化〕冠醚
Example sentencesExamples
Further studies of these aspects will help us to get better understanding of the phenomenon and might prove useful for explaining pharmacological effects of the crown ether superfamily at the molecular level.
In the example in the Scheme below, controlled polycondensation is achieved by using a low concentration of a crown ether to solublise a solid potassium benzoate initiator before reaction with a growing polymer chain in the liquid phase.
Several attempts were made to analyze the sample by chiral chromatography (Pirkle-type phases, cellulose derivatives, crown ethers) but a single peak was always found.
When a crown ether attached to their entire compound recognizes a particular functional group, like an ammonium ion, the whole system can contract or elongate (kind of like a ‘nanoscale molecular muscle’).
In the electrically neutral crown ether 6, six ethylene oxide monomers are linked into a circle that gives the molecule ion-complexing capacity and increases its rigidity.
Definition of crown ether in US English:
crown ether
noun
Chemistry
Any of a class of organic compounds whose molecules are large rings containing a number of ether linkages.
〔化〕冠醚
Example sentencesExamples
When a crown ether attached to their entire compound recognizes a particular functional group, like an ammonium ion, the whole system can contract or elongate (kind of like a ‘nanoscale molecular muscle’).
In the electrically neutral crown ether 6, six ethylene oxide monomers are linked into a circle that gives the molecule ion-complexing capacity and increases its rigidity.
In the example in the Scheme below, controlled polycondensation is achieved by using a low concentration of a crown ether to solublise a solid potassium benzoate initiator before reaction with a growing polymer chain in the liquid phase.
Several attempts were made to analyze the sample by chiral chromatography (Pirkle-type phases, cellulose derivatives, crown ethers) but a single peak was always found.
Further studies of these aspects will help us to get better understanding of the phenomenon and might prove useful for explaining pharmacological effects of the crown ether superfamily at the molecular level.