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Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
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Recrystallization: Solid–Solution Equilibria01:10

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Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
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Crystal Growth: Principles of Crystallization01:25

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Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
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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.
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Stereoisomers

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On the basis of mirror symmetry, stereoisomers of an organic molecule can be further classified into diastereomers and enantiomers. Diastereomers are stereoisomers that are not mirror images of each other. Substituted alkenes, such as the cis and trans isomers of 2-butene, are diastereomers, as these molecules exhibit different spatial orientations of their constituent atoms, are not mirror images of each other, and do not interconvert. Here, the interconversion is suppressed due to...
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Cristalización doblemente estereoconvergente habilitada por catálisis asimétrica

Pedro de Jesús Cruz1, William R Cassels1, Chun-Hsing Chen1

  • 1Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.

Science (New York, N.Y.)
|June 9, 2022
PubMed
Resumen

Este estudio introduce un nuevo método catalítico para la síntesis de productos farmacéuticos intermedios complejos. Controla eficientemente tres centros estereogénicos, aprovechando compuestos normalmente inestables para una construcción molecular precisa.

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Área de la Ciencia:

  • Química orgánica
  • Síntesis asimétrica
  • Catálisis

Sus antecedentes:

  • La síntesis eficiente de moléculas quirales es crucial para los productos farmacéuticos.
  • El control de múltiples centros estereogénicos, especialmente los labiles, sigue siendo un desafío.
  • Los métodos existentes a menudo luchan con productos intermedios estereocímicamente inestables.

Objetivo del estudio:

  • Desarrollar una nueva estrategia sintética para controlar múltiples centros estereogénicos.
  • Para aprovechar la inestabilidad inherente de ciertas moléculas orgánicas para la síntesis estereoselectiva.
  • Para crear un método convergente para preparar compuestos quirales complejos.

Principales métodos:

  • Adición asimétrica mediada por catalizador de Michael.
  • Transformación de diastereómeros inducida por la cristalización.
  • Enantioselectividad de la organocatálisis por base de Brønsted.
  • Cristalización convergente para el control termodinámico.

Principales resultados:

  • Se desarrolló un método de amplio alcance que controla tres centros estereogénicos.
  • Se utilizaron de manera productiva los 1,3-dicarbonilos y los nitroalcanes estereocímicamente inestables.
  • Se logró una síntesis eficiente de γ-nitro β-cetoamidas con tres estereocentros contiguos.

Conclusiones:

  • El método desarrollado ofrece un enfoque poderoso para la síntesis de moléculas quirales complejas.
  • El uso productivo de la inestabilidad de configuración mejora la eficiencia sintética.
  • Esta estrategia permite el acceso a componentes farmacéuticos valiosos.