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Videos de Conceptos Relacionados

Chair Conformation of Cyclohexane02:02

Chair Conformation of Cyclohexane

The chair conformation is the most stable form of cyclohexane due to the absence of angle and torsional strain. The absence of angle strain is a result of cyclohexane’s bond angle being very close to the ideal tetrahedral bond angle of 109.5° in its chair conformer. Similarly, the torsional strain is also absent owing to the perfectly staggered arrangement of bonds.
The hydrogen atoms linked to carbons are arranged in two different axial and equatorial orientations to achieve this staggered...
Conformations of Cyclohexane02:11

Conformations of Cyclohexane

Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts non-planar chair and boat conformations.
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal tetrahedral value,...
Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

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...
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.
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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 with both...
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

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

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.

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Preparation of a Corannulene-functionalized Hexahelicene by Copper(I)-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units
09:35

Preparation of a Corannulene-functionalized Hexahelicene by Copper(I)-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units

Published on: September 18, 2016

Rotaxano [3] ensamblado con cobre cuyos dos anillos actúan como alas de aleteo.

Antoine Joosten1, Yann Trolez, Jean-Paul Collin

  • 1Laboratoire de Chimie Organo-Minérale, Institut de Chimie, Université de Strasbourg-CNRS/UMR7177, 4 rue Blaise Pascal, 67070 Strasbourg Cedex, France.

Journal of the American Chemical Society
|January 13, 2012
PubMed
Resumen

Los investigadores desarrollaron un nuevo complejo de cobre [3]rotaxano utilizando la química del clic. Esta máquina molecular exhibe un movimiento único de "golpe de alas" provocado por cambios en la coordinación de los metales, allanando el camino para nuevas máquinas moleculares funcionales.

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Área de la Ciencia:

  • Química supramolecular de las moléculas.
  • Coordinación Química de la Coordinación
  • Ciencia de los materiales Ciencia de los materiales.

Sus antecedentes:

  • Los rotaxanos son moléculas mecánicamente entrelazadas con aplicaciones potenciales en máquinas moleculares.
  • La incorporación de centros metálicos puede introducir comportamientos dinámicos y sensibles en los sistemas de rotaxano.
  • La química de clic ofrece métodos eficientes y confiables para construir arquitecturas moleculares complejas.

Objetivo del estudio:

  • Para sintetizar un nuevo complejo de cobre [3]rotaxano con entornos de coordinación conmutables.
  • Para investigar la influencia de la coordinación del metal en la geometría y la dinámica del rotaxano.
  • Explorar el potencial de este sistema como una máquina molecular funcional.

Principales métodos:

  • Síntesis de un [3]rotaxano utilizando la química del clic para el tapón.
  • La complejidad con diferentes iones metálicos (Cu(I), Cu(II), Zn(2+)).
  • Análisis espectroscópico y estructural para determinar los modos de coordinación y la geometría.

Principales resultados:

  • Se sintetizó con éxito un nuevo rotaxano [3] complejo de cobre.
  • Los grupos triazol en el rotaxano pueden coordinarse con la esfera de coordinación del metal o permanecer fuera de ella.
  • El intercambio de metales (Cu(I) / Zn(2+)) o los procesos redox (Cu(II) / Cu(I)) inducen cambios geométricos significativos, lo que lleva a un movimiento de "aleteo de alas".

Conclusiones:

  • El rotaxano sintetizado exhibe un comportamiento dinámico controlable basado en la coordinación del metal.
  • El movimiento de "golpe de alas" observado es rápido y cuantitativo.
  • Este sistema es prometedor para el desarrollo de máquinas moleculares avanzadas y materiales sensibles.