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Videos de Conceptos Relacionados

Molecules with Multiple Chiral Centers02:25

Molecules with Multiple Chiral Centers

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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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Fischer Projections02:18

Fischer Projections

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Learning to draw Fischer projections of molecules and understanding their relevance plays a crucial role in the visual depiction of organic molecules. A Fischer projection is a two-dimensional projection on a planar surface to simplify the three-dimensional wedge–dash representation of molecules. This is especially helpful in the case of molecules with multiple chiral centers that can be difficult to draw. Here, all the bonds of interest are represented as horizontal or vertical lines.
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Chirality02:25

Chirality

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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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Chirality in Nature02:30

Chirality in Nature

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Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid.
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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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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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Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers
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De las hélices a los cristales: Representación multiscala de la quiralidad en estructuras de doble hélice

Chong-Yang Li1, Han Xu1, Pei-Ming Cheng1

  • 1Collaborative Innovation Center of Chemistry for Energy Materials, State Key Laboratory of Physical Chemistry of Solid Surfaces, and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.

Journal of the American Chemical Society
|October 2, 2023
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Resumen

Los investigadores descubrieron un raro fenómeno de transferencia de quiralidad de los átomos a las estructuras de doble hélice y cristales quirales. Este hallazgo revela el potencial de nuevos materiales magneto-ópticos basados en lantánidos.

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Área de la Ciencia:

  • Ciencias de los materiales
  • La cristalografía
  • Química orgánica

Sus antecedentes:

  • Los cristales quirales exhiben propiedades de polarización y rotación únicas.
  • El mecanismo de formación de estructuras cristalinas quirales a gran escala no se entiende completamente.

Objetivo del estudio:

  • Investigar la multitransferencia y la expresión de la quiralidad en diferentes escalas.
  • Para aclarar el mecanismo detrás de la formación de cristales quirales.
  • Para explorar las propiedades magneto-ópticas de las estructuras helicoidales quirales basadas en lantánidos.

Principales métodos:

  • Síntesis y caracterización de cristales quirales.
  • Análisis de cara de cristal y morfología teórica.
  • Espectroscopia de dicroísmo circular magnético (MCD).

Principales resultados:

  • Transferencia de quiralidad demostrada de átomos de carbono quirales a estructuras de doble hélice y cristales macroscópicos.
  • Identificó la distribución simétrica intrínseca y el crecimiento adquirido de las caras cristalinas como factores clave en la formación de cristales quirales.
  • Se observó una fuerte respuesta magneto-óptica en estructuras helicoidales quirales basadas en lantánidos, con la señal de CD reversible por un campo magnético externo.

Conclusiones:

  • El estudio revela un mecanismo integral para la formación de cristales quirales impulsado por grupos de amida derivados de aminoácidos.
  • Las estructuras helicoidales quirales basadas en lantánidos muestran un potencial significativo como materiales magneto-ópticos avanzados.