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Videos de Conceptos Relacionados

Prochirality02:05

Prochirality

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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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Molecules with Multiple Chiral Centers02:25

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Molecules that possess multiple chiral centers can afford a large number of stereoisomers. For instance, while some molecules like 2-butanol have one chiral center, defined as a tetrahedral carbon atom with four different substituents attached, several molecules like butane-2,3-diol have multiple chiral centers. A simple formula to predict the number of stereoisomers possible for a molecule with n chiral centers is 2n. However, there can be a lower number where some of the stereoisomers are...
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Stereoisomerism of Cyclic Compounds02:33

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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,...
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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...
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Radical Halogenation: Stereochemistry01:33

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Stereochemistry is the study of the different spatial arrangements of atoms in a given molecule. The stereochemistry of radical halogenations can be understood from three different situations:
Halogenation to form a new chiral center:
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Chirality at Nitrogen, Phosphorus, and Sulfur02:30

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Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
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Helicenes con expansión quiral dinámica

August J Rothenberger1, Inji Park1, Gavin R Kiel1

  • 1Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States.

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|November 22, 2025
PubMed
Resumen

Los investigadores exploraron la quiralidad dinámica en helicenos expandidos utilizando sustituyentes de aminas quirales. Este nuevo método permite el control de la estructura y la respuesta quiróptica, superando los desafíos en el aislamiento de enantiómeros individuales.

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Área de la Ciencia:

  • Química orgánica
  • Ciencia de los nanomateriales
  • Estudios de la quiralidad

Sus antecedentes:

  • Los helicenos expandidos son nanografenos quirales con una estructura única en forma de tornillo.
  • Su flexibilidad inherente hace que aislar enantiómeros individuales sea un desafío.
  • La quiralidad dinámica ofrece un método para controlar los sistemas quirales.

Objetivo del estudio:

  • Para instalar sustituyentes de aminas quirales en los [11]-helicenos expandidos.
  • Para explorar la quiralidad dinámica en helicenos expandidos.
  • Para lograr una respuesta quiróptica en helicenos expandidos sin resolución de enantiómero convencional.

Principales métodos:

  • Utilizó condensaciones de imina suaves, eficientes y reversibles.
  • Se han introducido sustituyentes quirales de aminas en la cavidad de un diformilo expandido [11]-heliceno.
  • Investigó las propiedades quirópticas de los compuestos sintetizados.

Principales resultados:

  • Logró un fuerte dicroísmo circular molar (hasta Δε radius = 300 M-1 cm-1) y factores de disimetría de absorción ( Radiusg Abs Radius = 0.010).
  • Demostró que la magnitud del dicroísmo circular puede ajustarse variando los sustituyentes quirales de aminas.
  • Correlacionó la respuesta quiróptica con las relaciones diastereoméricas de los helicenos.

Conclusiones:

  • Este estudio presenta la primera instancia de quiralidad dinámica en helicenos expandidos.
  • El método desarrollado ofrece una mejora sintética significativa con respecto a las técnicas tradicionales de resolución de enantiómeros.
  • Este enfoque proporciona una nueva vía para controlar y observar las respuestas quirópticas en los nanógrafos.