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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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Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

2.9K
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.
2.9K
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

2.3K
Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
2.3K
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

14.4K
The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
14.4K
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

4.4K
Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
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Equivalentes de tetrametilenoetano: reactivos recurrentes para adiciones ciclónicas serializadas.

Paul A Wender1, Matthew S Jeffreys1, Andrew G Raub1

  • 1Department of Chemistry, Department of Chemical and Systems Biology, Stanford University, Stanford, California 94305-5080, United States.

Journal of the American Chemical Society
|May 12, 2015
PubMed
Resumen

Los investigadores desarrollaron nuevos reactivos que permiten cicloadiciones secuenciales [4 + 2], construyendo eficientemente moléculas complejas. Este descubrimiento ofrece un enfoque paso a paso económico para sintetizar compuestos valiosos como productos farmacéuticos y materiales.

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Área de la Ciencia:

  • Química orgánica es la química orgánica.
  • Química sintética de la química sintética.
  • La catálisis de la catálisis.

Sus antecedentes:

  • Lograr la complejidad estructural de manera eficiente requiere reacciones que formen múltiples enlaces por paso.
  • Las cicloadiciones Diels-Alder y catalizadas por metales son potentes, pero a menudo requieren operaciones secuenciales.
  • Hay una necesidad de reactivos que amplifiquen la generación de complejidad en una sola operación.

Objetivo del estudio:

  • Introducir una nueva clase de reactivos capaces de recurrir ciclos de adición.
  • Demostrar la utilidad de estos reactivos en la síntesis de complejas estructuras carbo y heterociclicas.
  • Aplicar esta metodología a la síntesis de un nuevo fluoróforo solvatocrómico.

Principales métodos:

  • Síntesis del reactivo recurrente padre, el 2,3-dimetileno-4-trimetilsilibutan-1-ol (DMTB), a través de la metátesis de las olefinas.
  • Utilizando DMTB en secuencia Diels-Alder y catalizado por el metal [4 + 2] cicloadiciones.
  • El desencadenamiento de una eliminación viníloga de Peterson para regenerar un dieno para una segunda cicloadición.

Principales resultados:

  • Los reactivos desarrollados facilitan las cicloadiciones back-to-back [4 + 2] en una sola cascada catalítica.
  • Esta reacción multicomponente produce eficientemente diversos bloques de construcción carbo- y heterociclicas.
  • Se logró una síntesis exitosa en tres pasos del fluoróforo solvatocrómico 6-DMA.

Conclusiones:

  • Los nuevos reactivos recursivos ofrecen una poderosa estrategia para la rápida generación de complejidad en la síntesis orgánica.
  • Este enfoque proporciona una economía de paso, tiempo, costo y desperdicio en la síntesis de moléculas valiosas.
  • La metodología es aplicable a la creación de productos naturales, pistas terapéuticas, agentes de imagen y materiales.