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Base-Catalyzed Ring-Opening of Epoxides02:26

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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...
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Acid-Catalyzed Ring-Opening of Epoxides02:24

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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...
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Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration02:34

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The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
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Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH301:11

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All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...
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Thermal Electrocyclic Reactions: Stereochemistry01:17

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The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
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Apertura de anillos de arenas asistida por carbenos

Zengrui Cheng1, Haoran Xu2, Zhibin Hu1

  • 1State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, 100191 Beijing, China.

Journal of the American Chemical Society
|May 1, 2024
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores desarrollaron una nueva estrategia asistida por carbenos para la apertura de anillos de areno, transformando azidas de arilo en eninas policonjugadas. Este avance simplifica la síntesis y amplía las aplicaciones de la química de carbenos.

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Área de la Ciencia:

  • Química orgánica
  • Química sintética
  • Catálisis

Sus antecedentes:

  • La desaromatización de arenas y la funcionalización de C-H están avanzadas, pero la apertura de anillos de arenas sigue siendo un desafío.
  • Las altas energías de disociación y resonancia de los compuestos aromáticos impiden las reacciones de apertura de anillos.

Objetivo del estudio:

  • Introducir una nueva estrategia asistida por carbenos para la apertura eficiente de anillos de arena.
  • Para permitir la síntesis de moléculas de cadena policonjugada de valor añadido a partir de sustancias químicas de areno a granel.
  • Proporcionar una ruta simplificada para las eninas policonjugadas de azidas de arilo.

Principales métodos:

  • Desarrollo de una reacción asistida por carbenos para la apertura de anillos de areno.
  • Cálculos de la Teoría Funcional de la Densidad (DFT) para elucidar el mecanismo de reacción.
  • Aplicación del método a la modificación en etapa tardía de moléculas complejas y sistemas de anillos fundidos.

Principales resultados:

  • Demostró una nueva estrategia de apertura de anillos asistida por carbenos.
  • Convirtió con éxito varios derivados de azido de arilo en eninas policonjugadas valiosas.
  • Se logra la síntesis en condiciones sencillas, evitando precursores en varias etapas y reacciones de acoplamiento cruzado.
  • Verificó el mecanismo a través de cálculos de DFT, destacando su potencial para una amplia aplicación.

Conclusiones:

  • La estrategia asistida por el carbono ofrece una nueva vía para la apertura de un anillo.
  • Este método simplifica la síntesis de eninas policonjugadas, superando las limitaciones de los enfoques tradicionales.
  • Se espera que los hallazgos estimulen el uso de arenas en la síntesis de moléculas conjugadas complejas.