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Videos de Conceptos Relacionados

Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

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Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
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Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

Cycloaddition Reactions: MO Requirements for Thermal Activation

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Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
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Limitations of Friedel–Crafts Reactions01:26

Limitations of Friedel–Crafts Reactions

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Several restrictions limit the use of Friedel–Crafts reactions. First, the halogen in the alkyl halide must be attached to an sp3-hybridized carbon for the Friedel–Crafts reactions to occur. Vinyl or aryl halides do not react since the carbocations formed are unstable under the reaction conditions. Second, Friedel–Crafts alkylation is susceptible to carbocation rearrangement, and the major products obtained have a rearranged carbon skeleton. In contrast, the acylium ion is...
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Cyclohexenones via Michael Addition and Aldol Condensation: The Robinson Annulation01:27

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Robinson annulation is a base-catalyzed reaction for the synthesis of 2-cyclohexenone derivatives from 1,3-dicarbonyl donors (such as cyclic diketones, β-ketoesters, or β-diketones) and α,β-unsaturated carbonyl acceptors. Named after Sir Robert Robinson, who discovered it, this reaction yields a six-membered ring with three new C–C bonds (two σ bonds and one π bond).
2.7K
Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

2.5K
Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
2.5K
Synthesis and Decomposition Reactions02:17

Synthesis and Decomposition Reactions

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Synthesis and decomposition are two types of redox reactions. Synthesis means to make something, whereas decomposition means to break something. The reactions are accompanied by chemical and energy changes. 
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Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
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Construir estructuras orgánicas robustas por medio de reacciones multicomponentes

Peng-Lai Wang1, San-Yuan Ding1, Zhi-Cong Zhang1

  • 1State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering , Lanzhou University , Lanzhou , Gansu 730000 , China.

Journal of the American Chemical Society
|November 5, 2019
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores desarrollaron una nueva estrategia de reacción multicomponente (MCR) para crear marcos orgánicos covalentes (COF) altamente estables. Este método forma eficientemente cinco enlaces covalentes en un recipiente, lo que lleva a FOC robustos vinculados al imidazol para aplicaciones avanzadas.

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Área de la Ciencia:

  • Ciencias de los materiales
  • Química orgánica
  • Nanotecnología

Sus antecedentes:

  • Los enlaces robustos son cruciales para la síntesis y aplicación de marcos orgánicos covalentes (COF).
  • Los métodos existentes para la síntesis de COF requieren un mayor desarrollo para mejorar la estabilidad y la complejidad.
  • Las reacciones multicomponentes (MCR) ofrecen una vía prometedora para la construcción de un marco eficiente.

Objetivo del estudio:

  • Desarrollar una nueva estrategia basada en MCR para la construcción de marcos orgánicos covalentes ultraestables (COF).
  • Explorar la formación de COF complejos vinculados al imidazol utilizando materiales de partida fácilmente disponibles.
  • Investigar la integración de reacciones sofisticadas para el ensamblaje covalente preciso en estructuras porosas.

Principales métodos:

  • Utilizó la reacción multicomponente de Debus-Radziszewski (MCR).
  • Se empleó un enfoque de síntesis de un solo bote para la formación eficiente de enlaces.
  • Cuadrados orgánicos covalentes (COF) ensamblados vinculados al imidazol a partir de tres componentes simples.

Principales resultados:

  • Se ha construido con éxito una serie de COF ligados al imidazol.
  • Logró la formación de cinco enlaces covalentes por articulación cíclica en un solo paso sintético.
  • Demostró un alto nivel de complejidad y precisión en el ensamblaje covalente de materiales porosos.

Conclusiones:

  • La estrategia MCR desarrollada proporciona un método sólido para sintetizar COF altamente estables.
  • Este enfoque permite la creación de complejas estructuras cristalinas porosas con propiedades mejoradas.
  • Abre nuevas direcciones para el diseño de materiales avanzados mediante la integración de reacciones complejas reversibles e irreversibles.