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Videos de Conceptos Relacionados

Acid-Catalyzed Ring-Opening of Epoxides02:24

Acid-Catalyzed Ring-Opening of Epoxides

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Epoxides that are three-membered ring systems are more reactive than other cyclic and acyclic ethers. The high reactivity of epoxides originates from the strain present in the ring. This ring strain acts as a driving force for epoxides to undergo ring-opening reactions either with halogen acids or weak nucleophiles in the presence of mild acid. The acid catalyst converts the epoxide oxygen, a poor leaving group, into an oxonium ion, a better leaving group, making the reaction feasible. The...
9.0K
Base-Catalyzed Ring-Opening of Epoxides02:26

Base-Catalyzed Ring-Opening of Epoxides

10.2K
Due to their highly strained structures, epoxides can readily undergo ring-opening reactions through nucleophilic substitution, either in the presence of an acid or a base. The nucleophilic substitution reactions in the presence of acid are called acid-catalyzed ring-opening reactions, and nucleophilic substitution reactions in the presence of a base are called base-catalyzed ring-opening reactions. Epoxides undergo base-catalyzed ring-opening reactions in the presence of a strong nucleophile...
10.2K
Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism01:18

Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism

2.7K
Birch reduction uses solvated electrons as reducing agents. The reaction converts benzene to 1,4-cyclohexadiene. The reaction proceeds by the transfer of a single electron to the ring to form a benzene radical anion. This anion is highly basic—it abstracts a proton from the alcohol to form a cyclohexadienyl radical. Another single electron transfer gives the cyclohexadienyl anion. A proton transfer from the alcohol forms 1,4-cyclohexadiene. Since this reduction occurs via radical anion...
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Electrophilic 1,2- and 1,4-Addition of X2 to 1,3-Butadiene01:14

Electrophilic 1,2- and 1,4-Addition of X2 to 1,3-Butadiene

3.5K
Electrophilic addition of halogens to alkenes proceeds via a cyclic halonium ion to form a 1,2-dihalide or a vicinal dihalide.
3.5K
Electrophilic 1,2- and 1,4-Addition of HX to 1,3-Butadiene01:17

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8.1K
The electrophilic addition of hydrogen halides such as HBr to alkenes and nonconjugated dienes gives a single product as per Markovnikov’s rule.
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Base-Catalyzed Aldol Addition Reaction01:08

Base-Catalyzed Aldol Addition Reaction

4.6K
As depicted in Figure 1, base-catalyzed aldol addition involves adding two carbonyl compounds in aqueous sodium hydroxide to form a β-hydroxy carbonyl compound.
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Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-phosphinetriyltripiperidine]}palladium Under Mild Reaction Conditions
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Sin-1,4-Diaminación desodorizante catalizada por el paladio

William C Wertjes1, Mikiko Okumura1, David Sarlah1

  • 1Roger Adams Laboratory, Department of Chemistry , University of Illinois , Urbana , Illinois 61801 , United States.

Journal of the American Chemical Society
|December 20, 2018
PubMed
Resumen

Este estudio introduce un nuevo método de diaminación aromática sin-1,4- para la funcionalización de arenas y aminas simples. El eficiente protocolo de una sola olla proporciona un acceso rápido a bloques de construcción moleculares complejos con alta selectividad.

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Área de la Ciencia:

  • Química orgánica
  • Química sintética
  • Catálisis

Sus antecedentes:

  • Las estrategias de dearomatización son cruciales para acceder a arquitecturas moleculares complejas.
  • El desarrollo de métodos eficientes para la formación de enlaces C-N sigue siendo un desafío clave en la síntesis orgánica.

Objetivo del estudio:

  • Para reportar un nuevo protocolo de diaminación sin-1,4.
  • Para permitir la síntesis de bloques de construcción complejos a partir de arenas y aminas simples.

Principales métodos:

  • Adición de fotociclo [4+2] mediada por la luz visible para formar conductos paraciclóricos arenofilo.
  • Sustitución alilica formal catalizada por el paladio con nucleófilos de aminas.
  • Secuencia de reacción de una olla.

Principales resultados:

  • Se ha logrado la selectividad exclusiva de la sin-1,4-diaminación.
  • Se ha demostrado la desimetrización enantioselectiva del naftaleno.
  • Se habilitó la elaboración de moléculas de fármacos que contienen aminas.
  • Acceso a diversos productos insaturados para una mayor funcionalidad.

Conclusiones:

  • El método desarrollado ofrece una ruta rápida y directa a bloques de construcción complejos, de otro modo inaccesibles.
  • Esta estrategia de funcionalización creativa amplía el alcance de las transformaciones de areno y amina.
  • El protocolo facilita la síntesis de productos intermedios valiosos para la química medicinal y la ciencia de los materiales.