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Videos de Conceptos Relacionados

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

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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.
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Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

2.8K
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.
2.8K
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
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[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

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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.
10.8K
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

2.5K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Una jaula octaédrica sensible a la luz visible para adiciones transversales [2 + 2] eficientes y selectivas

Rikuya Tanaka1, Hiroki Takezawa1, Makoto Fujita2,3

  • 1Department of Applied Chemistry, School of Engineering, The University of Tokyo, Mitsui Link Lab Kashiwanoha 1, FS CREATION, 6-6-2 Kashiwanoha, Kashiwa, Chiba 277-0882, Japan.

Journal of the American Chemical Society
|July 15, 2025
PubMed
Resumen

Los investigadores desarrollaron una jaula sensible a la luz visible para mejorar las fotorreacciones. Esta jaula permite las cicloadiciones selectivas [2 + 2] de sustratos inertes utilizando luz visible, incluso catalíticamente.

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Área de la Ciencia:

  • Química supramolecular
  • La fotoquímica
  • Ciencias de los materiales

Sus antecedentes:

  • La complejación huésped-huésped influye en la selectividad de la fotorreacción al confinar sustratos.
  • Los anfitriones anteriores carecían de absorción de luz visible, lo que requería reactivos que absorbieran los rayos UV.
  • Las jaulas estándar M6L4 son huéspedes efectivos pero carecen de fotoactividad.

Objetivo del estudio:

  • Diseñar una jaula M6L4 sensible a la luz visible para las fotorreacciones.
  • Permitir las adiciones ciclónicas inducidas por la luz visible de sustratos inertes.
  • Lograr una alta selectividad estéreo y de sitio en las fotorreacciones a través del confinamiento.

Principales métodos:

  • Desarrollo de una jaula octaédrica M6L4 sensible a la luz visible.
  • Incorporación de unidades de Pt (II) ciclometalizadas fotoactivas en los vértices de las jaulas.
  • Utilizando la jaula para las cicloadiciones [2 + 2] inducidas por luz visible.

Principales resultados:

  • La nueva jaula conserva la capacidad de encapsulación mientras responde a la luz visible.
  • Se lograron cicloadiciones eficientes [2 + 2] inducidas por la luz visible de sustratos inertes.
  • Se demostró una perfecta selectividad estéreo y de sitio debido al confinamiento en el sustrato.
  • Se logró la cicloadición catalítica selectiva cruzada [2 + 2], una primicia para las jaulas M6L4.

Conclusiones:

  • Las jaulas M6L4 sensibles a la luz visible pueden generar fotorreacciones con alta selectividad.
  • Las unidades fotoactivas de Pt2 permiten transformaciones mediadas por la luz visible sin precedentes.
  • Este enfoque amplía el alcance de la química huésped-huésped en fotoquímica y catálisis.