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ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH301:11

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All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...
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Halogens are ortho–para directors. They are more electronegative than carbon. Therefore, as ring substituents, they can withdraw electrons through the inductive effect and deactivate the aromatic ring towards electrophilic substitution. Halogens also have an electron-donating resonance effect on the ring, which influences the orientation of the incoming electrophile. If an electrophile attacks at the ortho or the para position, the halogen donates electrons and stabilizes the intermediate...
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The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the para...
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The method to achieve α-brominated carboxylic acids using a mixture of phosphorus tribromide and bromine is known as the Hell–Volhard–Zelinski reaction. The reaction is catalyzed by phosphorus tribromide, which can be used directly or produced in situ from red phosphorus and bromine. The mechanism comprises PBr3 catalyzed conversion of acid to acid bromide and hydrogen bromide. The acid bromide enolizes to its enol form in the presence of HBr. The nucleophilic enol attacks the...
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Hydrolysis of acid halides is a nucleophilic acyl substitution reaction in which acid halides react with water to give carboxylic acids. The reaction occurs readily and does not require acid or a base catalyst.
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Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.
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Los reactivos de yodo hipervalentes, cruciales para la síntesis orgánica, son activados por ácidos. Este estudio aclara el mecanismo de esta activación utilizando PhI ((OAc) 2) y BF3 · Et2O, revelando conocimientos estructurales y electrónicos sobre la reactividad mejorada.

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Área de la Ciencia:

  • Síntesis orgánica
  • Química del yodo hipervalente
  • Catálisis

Sus antecedentes:

  • Los reactivos de yodo hipervalentes se utilizan ampliamente en los procesos oxidativos.
  • Los aditivos ácidos (Lewis o Brønsted) mejoran la reactividad de los λ3-iodanos.
  • El mecanismo preciso de esta activación inducida por el ácido sigue siendo poco conocido.

Objetivo del estudio:

  • Investigar el mecanismo de activación de reactivos de yodo hipervalentes por ácidos.
  • Para explorar la interacción entre PhI ((OAc) 2) y BF3·Et2O.
  • Para aclarar los factores estructurales y electrónicos responsables de una mayor reactividad.

Principales métodos:

  • Análisis espectroscópico para estudiar la interacción ácido-base dinámica.
  • Aislamiento y difracción de rayos X del complejo PhI ((OAc) 2-BF3).
  • Cálculos de la teoría funcional de la densidad (DFT) para el análisis de la estructura electrónica.

Principales resultados:

  • El complejo PIDA·BF3 fue aislado con éxito y su estructura determinada.
  • Los datos espectroscópicos confirmaron la interacción ácido-base dinámica entre el reactivo y el ácido de Lewis.
  • Los cálculos de DFT proporcionaron información sobre la redistribución electrónica y los cambios estructurales tras la activación.

Conclusiones:

  • El estudio proporciona la primera evidencia estructural de un complejo ácido-yodo.
  • Los hallazgos aclaran el origen de la mayor reactividad en los sistemas de yodo hipervalente activados por ácido.
  • Este trabajo profundiza la comprensión de los mecanismos de activación catalítica en la síntesis orgánica.