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Related Concept Videos

Elimination Reactions02:25

Elimination Reactions

13.1K
A nucleophile can react with an alkyl halide to give the substitution product by displacing the halogen. Or it can function as a base to give the elimination product by deprotonation of the neighboring carbon to form an alkene. In an elimination reaction, the substrate loses two groups from adjacent carbons forming at least one π bond. The carbon attached to the halogen is called the α carbon, while the adjacent carbon is called the β carbon; hence, these reactions are called...
13.1K
Nucleophilic Aromatic Substitution: Elimination–Addition01:11

Nucleophilic Aromatic Substitution: Elimination–Addition

3.9K
Simple aryl halides do not react with nucleophiles. However, nucleophilic aromatic substitutions can be forced under certain conditions, such as high temperatures or strong bases. The mechanism of substitution under such conditions involves the highly unstable and reactive benzyne intermediate. Benzyne contains equivalent carbon centers at both ends of the triple bond, each of which is equally susceptible to nucleophilic attack. This 50–50 distribution of products is...
3.9K
Base-Promoted α-Halogenation of Aldehydes and Ketones00:51

Base-Promoted α-Halogenation of Aldehydes and Ketones

3.3K
α-Halogenation of aldehydes and ketones is a reaction involving the substitution of α hydrogens with halogens in the presence of a base.  The reaction begins with the abstraction of  α hydrogen by the base to produce a nucleophilic enolate ion. This intermediate undergoes a subsequent nucleophilic substitution with the halogen to produce a monohalogenated carbonyl compound. If the starting substrate has more than one α hydrogen, it is difficult to stop the reaction...
3.3K
Acid-Catalyzed α-Halogenation of Aldehydes and Ketones01:21

Acid-Catalyzed α-Halogenation of Aldehydes and Ketones

3.5K
By replacing an α-hydrogen with a halogen, acid-catalyzed α-halogenation of aldehydes or ketones yields a monohalogenated product
In the first step of the mechanism, the acid protonates the carbonyl oxygen resulting in a resonance-stabilized cation, which subsequently loses an α-hydrogen to form an enol tautomer. The C=C bond in an enol is highly nucleophilic because of the electron-donating nature of the –OH group. Consequently, the double bond attacks an electrophilic...
3.5K
Radical Formation: Elimination00:51

Radical Formation: Elimination

1.6K
Another method of radical formation is the elimination process. It is the opposite of the addition route and is driven by the instability of the radical. For example, as depicted in Figure 1, dibenzoyl peroxide yields a pair of unstable radicals upon homolysis. Given its instability, this radical spontaneously undergoes elimination via a C–C bond cleavage to form a relatively more stable phenyl radical. The mechanism involves cleavage of the bond between the α and β positions...
1.6K
E1 Reaction: Kinetics and Mechanism02:46

E1 Reaction: Kinetics and Mechanism

15.0K
Here, in contrast to the E2 reaction mechanism, we delve into the aspects of the E1 reaction mechanism, which has two steps: rate-limiting loss of the leaving group and abstraction of the beta hydrogen by a weak base. Typically, the experimental proof for the E1 mechanism is via kinetic studies or isotope studies. While the former demonstrates the first-order kinetics—the dependence of the reaction solely on substrate concentration—the latter proves the abstraction of hydrogen only...
15.0K

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Photoredox-Catalyzed Decarboxylative Elimination via Halogen Atom Transfer.

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This study presents a green photocatalytic method for synthesizing enamides using amino acid decarboxylation. This efficient approach avoids transition metals and preactivation, offering a scalable and economical alternative.

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Area of Science:

  • Organic Chemistry
  • Green Chemistry
  • Photocatalysis

Background:

  • Enamides and enecarbamates are valuable synthetic intermediates.
  • Traditional synthesis methods can be inefficient or environmentally taxing.
  • Amino acid decarboxylation offers a sustainable route to key reagents.

Purpose of the Study:

  • To develop a direct photocatalytic method for synthesizing enamides.
  • To utilize readily available amino acids as starting materials.
  • To establish an efficient and green synthetic protocol.

Main Methods:

  • Employing a photocatalytic system for direct decarboxylation.
  • Utilizing sequential radical decarboxylation and halogen-atom transfer (XAT).
  • Operating under mild reaction conditions without transition metals.

Main Results:

  • Successful direct synthesis of enamides from amino acids.
  • Demonstration of a scalable, economical, and efficient protocol.
  • Avoidance of preactivation of carboxylic acids and use of transition metals.

Conclusions:

  • The developed photocatalytic method provides a green and efficient route to enamides.
  • This approach simplifies synthesis by using amino acid decarboxylation.
  • The protocol is operationally simple, scalable, and cost-effective.