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Videos de Conceptos Relacionados

Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the generated carbocation,...
Pericyclic Reactions: Introduction01:17

Pericyclic Reactions: Introduction

Pericyclic reactions are organic reactions that occur via a concerted mechanism without generating any intermediates. The reactions proceed through the movement of electrons in a closed loop to form a cyclic transition state, where rearrangement of the σ and π bonds yields specific products.
Pericyclic reactions can be classified into three categories: electrocyclic reactions, cycloaddition reactions, and sigmatropic rearrangements. Electrocyclic reactions and sigmatropic rearrangements are...
Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

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.
Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

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.
Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

Cycloaddition Reactions: MO Requirements for Thermal Activation

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.
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

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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La macrociclización eficiente se logra a través del control conformacional utilizando las interacciones no covalentes

Philippe Bolduc1, Alexandre Jacques, Shawn K Collins

  • 1Université de Montréal, Département de Chimie, C.P. 6128 Station Downtown, Montréal, Québec, H3C 3J7, Canada.

Journal of the American Chemical Society
|August 27, 2010
PubMed
Resumen

La sal de quinolinio 3 promueve efectivamente la macrociclación para la síntesis de ciclófano rígido utilizando la metástasis de olefinas o el acoplamiento Glaser-Hay. Este elemento de control de conformación (CCE) es fácilmente sintetizado, modificable y recuperable.

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Área de la Ciencia:

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

Sus antecedentes:

  • La macrociclización es crucial para la síntesis de complejas arquitecturas moleculares.
  • Los métodos tradicionales a menudo tienen dificultades para formar ciclófanos rígidos de manera eficiente.

Objetivo del estudio:

  • Introducir un nuevo aditivo, la sal de quinolinio 3, como elemento de control de la conformación (CCE).
  • Demostrar la utilidad de las CCE en la promoción de reacciones de macrociclado.

Principales métodos:

  • Utilizando la sal de quinolinio 3 en las reacciones de metástasis de olefinas.
  • El uso de la sal de quinolinio 3 en las reacciones de acoplamiento Glaser-Hay.
  • Caracterizando los ciclófanos rígidos resultantes.

Principales resultados:

  • La sal de quinolinio 3 mejora significativamente los rendimientos de macrociclosión para los ciclofanos rígidos.
  • El aditivo facilita la ciclización en reacciones que de otro modo fracasarían.
  • El CCE es fácilmente sintetizado, modificable y recuperable a través de la filtración.

Conclusiones:

  • La sal de quinolinio 3 es un aditivo versátil y eficaz para la macrociclización.
  • Este enfoque proporciona una nueva estrategia para la construcción de ciclófanos rígidos.
  • Los aditivos desarrollados ofrecen ventajas prácticas en síntesis y purificación.