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Perfluoromethyl vinyl ether
. Glycol Ethers
Ether Elastomer .
- A crown ether is a
molecule containing hydrogen, carbon and oxygen atoms. Each
oxygen atom is bound between two of the carbon atoms and arranged in
a ring (hence "crown").
- Crown ethers are named
as x-crown-y where x denotes the total number of atoms in
the cyclic backbone and y denotes the number of oxygen atoms.
- Because of their
strong binding ability, crown ethers are often added to reactions
with ionic reagents, in which the reacting part is the anion.
- The cation is bound by
crown ether, which ensures solubility, while the anion, in the
organic solvent, is
practically free of solvation and thus very reactive.
- The original crown
ether discovered by Charles Pedersen has six oxygen atoms exposed
along the inside wall of the ring.
- In accepting specific
atoms lock and key fashion, crown ethers mimic in a relatively
uncomplicated way the very complicated functions of biological
materials such as
- Crown ethers also have
potential to be used as "scavengers" to remove certain elements like
radioactive strontium from the environment or to regulate
sodium in the blood.
- Crown ethers
containing hydrophobic exteriors are lipophilic hosts, which can
include cations, especially alkali and alkaline earth metal ion,
into their cavities via an ion-dipole interaction.
- Crown ether is the
other important class of phase-transfer catalysts which critically
differs from the onium salt, in that the whole inorganic salt is
transferred into the organic phase.
- The reaction modes
described above can generally be accommodated in such crown
ether-catalyzed reactions, simply by replacing the onium cation by
a metal cation complex of crown ether.
- An interesting thing
about a crown ether is that the ring can capture a positively
charged ion like a metal ion and an ammonium ion. The negatively
of the oxygen atomspointing inward are used to attract and catch the
property made including pulling ionic substances into organic
- Since crown ethers are
the molecules that was chosen to bind the sodium cation
contaminants in waste water, they were chemically modified to allow
- Crown ethers have been
considered as a useful medium for isotope separation.
- The ability of crown
ethers to complex cations has been used to study a large number of
applications such as the production of sensors and the selective
extraction of cations or the ionic transport in membranes.
- Crown Ethers.
- Discovery of Crown
Information about Crown Ethers.
- What is Crown Ethers?
Ethers-Introduction to Molecular Recognition.
Msds of Crown Ether/12-Crown-4.
Aza-18-Crown-6, 98% -MSDS.
18-Crown-6, 99% MSDS.
Msds of 12-Crown-4.
Safety Sheet of 18-Crown-6.
- Synthesis of
carbohydrate-based Crown ethers and their application in
Synthesis and molecular recognition of proton
ionizable crown ethers.
Synthesis of crown ethers based on
One-pot synthesis of novel thioxanthone crown
Purification of waste water with crown ethers
anchored on a solid support.
Synthesis and antimicrobial activity of new
crown ethers of schiff base type.
New soluble subphthalocyanine substituted with
Synthesis of a Novel D-Glucose-Conjugated
15-Crown-5 ether with a spiro ketal structure.
- Chiral Crown
Calixarene Crown Ether solvent composition and
use for extraction of cesium from alkaline waste solutions.
Perfluoro-crown ethers in fluorine magnetic
Method of preparing a nanoparticle iron-crown
Crown Ether derivatives.
Process for separating by means of crown
ethers the uranium and plutonium present in an aqueous medium.
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- Isotope Effects of
Zinc in Crown Ether Chromatography.
- Field-Dependent Effect
of Crown Ether on ionic conductance of alpha-Hemolysin channels.
- Effects of Crown
ethers and small amounts of co solvent on the activity.
- New Columnar crown
- Design and synthesis
of next generation of Crown ethers for waste separations.
- Effect of the presence
of crown ether on ion transport across the lipid bilayer.
- Tweezer-like complexes
of Crown Ethers with divalent metals.
- Interlayer adsorption
of macro cyclic compounds in 2:1 phyllosilicates.
reduction of crown ether complexation.
- Crown Ether
Palladacycles as metalloligands.
- Complexation studies
of crown ethers with alkali metal cations in methanol.
cage-annulated crown ethers.
- Crown ethers bearing
- Selective Binding of
NH4+ by redox-active crown ethers.
- Molecular Design of
Crown Ethers and Catenanes for incorporation into metal-organic
- Phosphine an pyridine
functionalized crown ethers.
- Phase transfer
- Non-Covalent chemical
modification of crown ether.
- Synthesis of Crown
Ether ligands for use in metal organic frameworks.
- Application of
macrocycle compounds for metal ions separation and removal.
- Application of Crown
Ethers and ferrocyanide based inorganic material for strontium
- Crown Ethers:
application in inorganic synthesis.
- Application of crown
ethers as phase transfer catalysis in the electron transfer
reactions of coal.
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