Examples of 'crown ether' in a sentence
Meaning of "crown ether"
Crown ether refers to a class of chemical compounds characterized by a ring-shaped structure containing multiple oxygen atoms. These compounds are known for their ability to coordinate with metal ions and enhance the solubility and stability of certain chemical reactions. Crown ethers are commonly used in various fields such as chemistry, biochemistry, and material science for their unique properties and applications
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- any of a class of macrocyclic compounds containing repeat units of -CH₂CH₂O-
- any similar compound containing atoms of nitrogen, sulphur, phosphorus or silicon instead of, or as well as, oxygen
How to use "crown ether" in a sentence
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crown ether
Crown ether addition had no beneficial effect.
Represents a group derived from a crown ether.
Lariat crown ether.
Another potentially useful accelerator component is crown ether.
Crown ether radicals in particular allow the detection of alkaline ions.
Preferred donor compounds are crown ether and cryptands.
Suitably the phase transfer catalyst is a quaternary salt or a crown ether.
The invention comprises incorporating a crown ether in the lithographic ink.
The reaction may also be performed in the presence of a crown ether.
The crown ether retrodiffuses to the first interface of the liquid membrane.
Many early examples of such systems are based on crown ether chemistry.
The amount of crown ether to be used can vary over wide limits.
The reduction in glazing is accomplished by incorporating a crown ether in the composition.
The effect of added crown ether and cryptand complexing agents was also investigated.
We herein describe a particle containing a perfluoro crown ether in combination with gadolinium.
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This reaction may be performed in the presence of a catalytic amount of a crown ether.
A catalyst such as potassium iodide or a crown ether may be used to assist reaction.
It is especially preferred that this step be performed in the presence of a crown ether.
Many guest compounds for use with crown ether are also known.
Crown ether compounds are readily available from commercial sources or may be readily prepared.
It may also comprise more than one crown ether according to the invention.
The crown ether may be specific for one or more types of or particular cations.
The yield was lower in both cases than when the crown ether was absent.
Excess acid locks the crown ether by protonation and again the complex is dethreaded.
More preferably the phase transfer catalyst is a quaternary ammonium salt or a crown ether.
A suitable crown ether may be added as a phase transfer agent to accelerate the alkylation process.
The denticity of the polyether influences the affinity of the crown ether for various cations.
The crown ether performs the function of host and the ion that of guest.
The catalyst system employed within the scope of the present invention also comprises a crown ether.
Here the crown ether is used to phase transfer the basic alkali metal alkoxylation catalyst.
The catalyst may comprise a basic alkali metal compound which has undergone crown ether complex formation.
Dioxane resembles a smaller Crown ether with only two ethyleneoxyl units.
In particular, a preferred cyclic compound is a crown ether.
Crown ether nomenclature corresponds to the following rules,.
In one embodiment, the host is a crown ether.
In the present reaction, crown ether compound can be added.
In certain embodiments, the catalyst is a crown ether.
In such embodiments, the crown ether may also function as vehicle.
A process according to claim 4 wherein the catalyst is a crown ether.
The process of claim 5 wherein the crown ether is a cyclic polymer of ethylene glycol.
Process according to claims 1 wherein the sodium complex is a crown ether.
As a consequence, the crown ether comprises at least one orthoester or a thio-analogue thereof.
In another aspect, the phase transfer catalyst can be a crown ether.
The composition of claim 1 wherein the crown ether is a cyclic polymer of ethylene glycol.
The reaction can also be carried out in the co-presence of crown ether.
Crown ether and cryptand cation-complexing agents have a retarding effect on the rate.
Suitable solvents include sulpholane, dimethylformamide or a mixture of acetonitrile and a crown ether.
The use of cyclodextrin is preferred over crown ether and calix [ n ] arene hosts.
The method of claim 1 wherein the ion exchange function comprises a crown ether.
Upon the addition of crown ether ligands, one can obtain salts of the solvated electrons.
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Push the two crown halves apart
And crown thy good with brotherhood
Seven stars and a crown on a field of blue
