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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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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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Chirality in Nature02:30

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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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Chirality02:25

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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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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. While...
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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.
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Transferencia de quiralidad bidimensional a través de la reacción en la superficie

Haiming Zhang1, Zhongmiao Gong1, Kewei Sun1

  • 1Institute of Functional Nano&Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University , 199 Ren'ai Road, Suzhou, Jiangsu 215123, People's Republic of China.

Journal of the American Chemical Society
|August 23, 2016
PubMed
Resumen

La quiralidad se transfirió de moléculas autoensambladas a nuevas moléculas utilizando la síntesis en la superficie. La estructura de los precursores autoensamblados dictó la quiralidad de los productos covalentemente unidos resultantes, lo que permitió el control de la quiralidad molecular.

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Área de la Ciencia:

  • Química de las superficies
  • Síntesis orgánica
  • Estudios de quiralidad

Sus antecedentes:

  • La quiralidad es crucial en el reconocimiento molecular y los procesos biológicos.
  • La síntesis en la superficie ofrece una plataforma para crear arquitecturas moleculares complejas.
  • El control de la quiralidad en las moléculas sintetizadas sigue siendo un desafío significativo.

Objetivo del estudio:

  • Para lograr la transferencia bidimensional de quiralidad de las moléculas autoensambladas a los productos enlazados covalentemente.
  • Investigar la influencia de las estructuras autoensambladas precursoras en la quiralidad de las moléculas sintetizadas.
  • Para explorar la síntesis en la superficie para crear oligo-p-fenilenos quirales.

Principales métodos:

  • Síntesis en la superficie en sustratos Au{111).
  • Utilizando el 1,4-dibromo-2,5-didodecilbenceno (12DB) y el 1,4-dibromo-2,5-ditridecilbenceno (13DB) como precursores.
  • Microscopía de túnel de barrido (STM) para las investigaciones estructurales.

Principales resultados:

  • La reacción de acoplamiento arilo-arilo se produjo entre los precursores vecinos más cercanos, preservando la estructura lamelar autoensamblada.
  • Los dominios homoquirales de los precursores (12DB) dieron lugar a los dominios homoquirales de los oligo-p-fenilenos (OPP).
  • Los precursores de geometría quiral mixta (13DB) dieron lugar a láminas racémicas de OPP.

Conclusiones:

  • Es factible la transferencia bidimensional de la quiralidad de los precursores autoensamblados a los productos unidos covalentemente.
  • La estructura autoensamblada de los precursores dicta directamente la quiralidad de las moléculas sintetizadas.
  • La síntesis en superficie proporciona una ruta para controlar la quiralidad molecular a través del diseño de precursores.