crown ether वाक्य
उदाहरण वाक्य
मोबाइल
- The first simple enzyme mimics were based on crown ether and cryptand.
- In the research lab, crown ethers are used for this purpose.
- Lariat crown ethers have sidearms that can augment complexation of cation.
- Crown ethers, like 15-crown-5, may be used as a phase-transfer catalyst.
- A chiral substituted crown ether catalyst developed by Jean-Marie Lehn for ester cleavage.
- Like crown ethers, cyclen compounds are capable of selectively binding cations.
- Since the salt is poorly soluble in nonpolar solvents, crown ethers are typically used.
- A notable example of catalysts that employ this mechanism is Jean-Marie Lehn's crown ether.
- Excess acid locks the crown ether by protonation and again the complex is dethreaded.
- The bis-macrocycle ( red ) contains two phenanthroline units in a crown ether chain.
- Crown ethers are not the only macrocyclic ligands that have affinity for the potassium cation.
- The crown ethers are examples of small polyethers.
- Lithium ions may be chemically removed by binding to species such as cryptands or crown ethers.
- Basically, it was research on a crown ether compound, a biological mimic of an ion channel,
- Such salts can be isolated by the addition of macrocyclic ligands such as crown ether and cryptands.
- This process is accompanied by an increase in emission intensity at 343 nm resulting from freed crown ether.
- The breakthrough came in the 1960s with the synthesis of the crown ethers by Charles J . Pedersen.
- Charles J . Pedersen won the 1987 Nobel Prize in Chemistry for his methods of synthesizing crown ethers.
- Reaction of benzoquinone with trimethylsilylcyanide, catalyst KCN is introduced as a 1 : 1 complex with the Crown ether 18-crown-6
- In 1984 Olmstead presented the lithium crown ether salt of the triphenylmethyl carbanion from triphenylmethane, n-butyllithium and 12-crown-4 at low temperatures:
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