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Bromination and chlorination of aromatic rings by electrophilic aromatic substitution reactions are easily achieved, but fluorination and iodination are difficult to achieve. Fluorine is so reactive that its reaction with benzene is difficult to control, resulting in poor yields of monofluoroaromatic products. To address this, Selectfluor reagent is used as a fluorine source in which a fluorine atom is bonded to a positively charged nitrogen.
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If a set of reactants can yield multiple constitutional isomers, but one of the isomers is obtained as the major product, the reaction is said to be regioselective. In such reactions, bond formation or breaking is favored at one reaction site over others.
The hydrohalogenation of an unsymmetrical alkene can yield two haloalkane products, depending on which vinylic carbon takes up the halogen. However, one product usually predominates, where hydrogen adds to the vinylic carbon bearing the...
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Electrophilic addition of halogens to alkenes proceeds via a cyclic halonium ion to form a 1,2-dihalide or a vicinal dihalide.
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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.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
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A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn...
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Reduction of Alkenes: Catalytic Hydrogenation02:13

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Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
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Fluoración nucleofílica divergente bajo catálisis de enlace de hidrógeno: un estudio computacional y experimental

Matthew A Horwitz1, Alexander B Dürr1, Konstantinos Afratis1

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Los investigadores desarrollaron nuevos métodos catalíticos para las reacciones de fluoración nucleófila. Estos enfoques controlan los resultados regioquímicos, lo que permite la síntesis de isómeros específicos de fluoroamina a partir de un solo precursor utilizando catalizadores de urea.

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Área de la Ciencia:

  • Química orgánica
  • Catálisis
  • Química de la fluoración

Sus antecedentes:

  • La regioselectividad controlada en la fluoración nucleofílica utilizando fluoruro de metales alcalinos sigue siendo un desafío significativo.
  • El desarrollo de sistemas catalíticos para el control preciso de las reacciones de fluoración es crucial para la química sintética.

Objetivo del estudio:

  • Presentar dos enfoques sinérgicos para los resultados regioquímicos controlados en las reacciones de fluoración nucleófila.
  • Explorar el uso de la catálisis de enlace de hidrógeno, específicamente los catalizadores de urea, para dirigir las vías de fluoración.

Principales métodos:

  • Utilizando catalizadores de urea donante con enlace de hidrógeno para modular la densidad de carga de fluoruro.
  • Investigación de la regioselectividad cinética en la fluoración de sales asimétricas de aziridinio.
  • Informe de un reordenamiento diotrópico formal catalizado por urea para la edición regioquímica.

Principales resultados:

  • Se ha demostrado que los catalizadores de urea influyen en la regioselectividad cinética en la fluoración de las sales de aziridinium.
  • Se logra la edición regioquímica a través de un reordenamiento diotrópico controlado termodinámicamente que incluye escisión de enlaces C-F y rebote de fluoruro.
  • Permitió el acceso a los regioisómeros de fluoroamina enriquecidos con enantio de un solo precursor de cloroamina.

Conclusiones:

  • Se han presentado nuevas estrategias sinérgicas para la fluoración nucleofílica regioselectiva.
  • Destacó la utilidad de la catálisis de enlace de hidrógeno a base de urea en el control de las vías de reacción.
  • Se han abierto nuevas vías para la organocatálisis asimétrica regiodivergente.