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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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SN2 Reaction: Stereochemistry02:23

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In an SN2 reaction, the nucleophilic attack on the substrate and departure of the leaving group occurs simultaneously through a transition state. As the nucleophile approaches the substrate from the back-side, the configuration of the substrate carbon changes from tetrahedral to trigonal bipyramidal and then back to tetrahedral, leading to an inversion in the configuration of the product.
If the substrate is an achiral molecule at the α-carbon, the inversion of configuration is not...
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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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SN1 Reaction: Stereochemistry02:15

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This lesson provides an in-depth discussion of the stereochemical outcomes in an SN1 reaction.
In the first step of an SN1 reaction, the bond between the electrophilic carbon and the leaving group ionizes to generate the carbocation intermediate. The second step of the mechanism is the nucleophilic attack.
In the formed carbocation, the positively charged carbon is sp2 hybridized with a trigonal planar geometry. As all the three substituents lie on the same plane, a plane of symmetry for the...
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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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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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Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy
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Máquina Unimolecular de Inversión Quiral por Pasos

Yonghui Sun1, Lijuan Liu1, Linnan Jiang1

  • 1College of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, P. R. China.

Journal of the American Chemical Society
|July 24, 2023
PubMed
Resumen

Este estudio presenta una nueva máquina molecular de inversión quiral unimolecular (SIMM) que logra una inversión quiral reversible utilizando estímulos redox. Esta máquina molecular ofrece una nueva vía para desarrollar sistemas quirales avanzados que responden al estímulo.

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Área de la Ciencia:

  • Máquinas moleculares
  • Química supramolecular
  • Quiralidad

Sus antecedentes:

  • Las máquinas moleculares inteligentes que responden a la luz, la electricidad y la temperatura son de gran interés.
  • Las máquinas moleculares que responden a estímulos son cruciales para los avances en química, ciencia de materiales y biología.

Objetivo del estudio:

  • Construir e investigar una máquina molecular unimolecular de inversión por pasos quirales (SIMM).
  • Para demostrar la inversión quiral desencadenada por redox y la conmutación reversible de la señalización de CD.

Principales métodos:

  • Síntesis de un SIMM mediante el acoplamiento de un pilar de dibromo[5]areno y un derivado de tetratiofulvaleno (TTF).
  • Experimentos electroquímicos para estudiar las propiedades redox.
  • Espectroscopia de dicroísmo circular (CD) para monitorear el cambio quiral.

Principales resultados:

  • El SIMM exhibe una inversión de paso quiral provocada por un potencial redox de dos electrones.
  • Los procesos de redox inducen la conmutación reversible de la señal de CD del SIMM.
  • La inversión quiral se logró e invirtió utilizando oxidantes químicos y agentes reductores.

Conclusiones:

  • Este trabajo demuestra la inversión unimolecular quiral en respuesta a estímulos redox.
  • El SIMM desarrollado proporciona una nueva plataforma para la quiralidad sensible al estímulo.
  • Esta investigación abre nuevas vías para diseñar máquinas moleculares avanzadas.