enolate वाक्य
उदाहरण वाक्य
मोबाइल
- The enolate intermediate discussed earlier is stabilized by residues additional hydrogen bonds to Tyr199 and Asn148.
- It rather promotes conjugate addition by binding to the zwitterionic enolate, and stabilizing these intermediates.
- Z must be powerful enough to facilitate deprotonation to the enolate ion even with a mild base.
- Crossed Claisen condensations, in which the enolate and nucleophile are different esters, are also possible.
- The trimethylsilyl enol ethers can also be used as masked enolate equivalents in the Mukaiyama aldol addition.
- In the scheme shown, the enol or enolate of a methyl ketone reacts with an aldehyde.
- Competing work with lithium enolate aldol reactions was published also in 1973 by Herbert O . House.
- The enolate anion exhibits significant delocalization, and the highest electron density is on the second carbon.
- Because carbonyl compounds are only weakly acidic, a strong base is needed for enolate ion formation.
- In this reaction the rate-limiting step is formation of the enolate by deprotonation of the ketone.
- Its major application involves the Reformatsky reaction, wherein it reacts with zinc to form a zinc enolate.
- The masked functionality approach to regiospecific enolate formation has been widely used in total synthesis of natural products.
- The enolate undergoes electrophilic attack by the hypohalite ( containing a halogen with a formal + 1 charge ).
- Usually, vicinal difunctionalizations are carried out in one pot, without the intermediacy of a neutral protected enolate.
- Chiral ketene enolate formation via nucleophilic activation by the cinchona alkaloid facilitates enantioselective and diastereoselective ?-lactam synthesis.
- Two main types of reactions can occur with acetyl cyanide as a reactant; aldol condensation and enolate substitution.
- Double-activation makes the enolate more stable, so not as strong a base is required to form it.
- It is easily deprotonated to give the sodium salt of the enolate ( m . p . 245 �C ).
- Enolate formation will be thermodynamically favoured at the most acidic proton which depends on the electronic stabilization of the resulting anion.
- A carbon-carbon bond alpha to a carbonyl can usually be disconnected to an enolate equivalent and a carbon electrophile.
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