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Videos de Conceptos Relacionados

Conformations of Cyclohexane02:11

Conformations of Cyclohexane

13.0K
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...
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Chair Conformation of Cyclohexane02:02

Chair Conformation of Cyclohexane

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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...
15.1K
Stereoisomerism of Cyclic Compounds02:33

Stereoisomerism of Cyclic Compounds

9.1K
In this lesson, we delve into the role of ring conformation and its stability, which determines the spatial arrangement and, consequently, the molecular symmetry and stereoisomerism of cyclic compounds. 1,2-Dimethylcyclohexane is used as a case study to evaluate the possible number of stereoisomers. Here, given the multiple (n = 2) chiral centers, there are 2n = 4 possible configurations that lack a plane of symmetry, as the ring skeleton exists in a non-planar chair conformation. In addition,...
9.1K
Prochirality02:05

Prochirality

3.9K
The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
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Chirality02:25

Chirality

25.1K
Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
25.1K
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

2.9K
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...
2.9K

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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
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Un catenano quiral co-conformado "topológicamente"

Arnau Rodríguez-Rubio1, Andrea Savoini1, Florian Modicom1

  • 1Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, United Kingdom.

Journal of the American Chemical Society
|June 28, 2022
PubMed
Resumen

Los investigadores sintetizaron un nuevo catenano con una unidad quiral única. Este avance en la quiralidad topológica ofrece nuevas posibilidades para diseñar arquitecturas moleculares complejas.

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Área de la Ciencia:

  • Química supramolecular
  • Química orgánica
  • Estereoquímica

Sus antecedentes:

  • La quiralidad topológica en las catenanas surge de la disposición específica de los átomos dentro de los anillos achirales, lo que lleva a la simetría Cnh.
  • Una forma relacionada pero menos explorada de quiralidad, denominada "coconformalmente topológicamente quiral", ocurre cuando un anillo simétrico (Cnv) está influenciado por un macrociclo orientado adyacente.

Objetivo del estudio:

  • Para sintetizar un catenano altamente enantioenriquecido con la unidad estereogénica "coconformalmente topológicamente quiral".
  • Para explorar y demostrar esta fuente pasada por alto de quiralidad en moléculas mecánicamente entrelazadas.

Principales métodos:

  • Síntesis de una nueva estructura de catena.
  • Utilizando técnicas para lograr un alto enriquecimiento enantiomérico.
  • Caracterización de la arquitectura molecular resultante y sus propiedades quirales.

Principales resultados:

  • Síntesis exitosa de un catenano con una unidad quiral co-conformacional altamente enriquecida con enantio.
  • Demostración de la desimetrización de un anillo Cnv por un macrociclo orientado.
  • Confirmación de la existencia de la nueva unidad estereogénica y de su contribución a la quiralidad general.

Conclusiones:

  • El estudio presenta un nuevo método para crear catenanas topológicamente quirales.
  • Destaca la importancia de las unidades quirales de coconformación en el diseño molecular.
  • Abre caminos para el desarrollo de materiales quirales avanzados y catalizadores basados en catenanos.