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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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Substituents on the benzene ring that direct an incoming electrophile to undergo substitution at the meta position are called meta directors. All meta directors either have a positive charge on the atom directly bonded to the ring or a partial positive charge. These groups function by withdrawing electrons from the ring through inductive and resonance effects. Consider the carbocation intermediates formed upon the addition of an electrophile on nitrobenzene at the...
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Diazonium Group Substitution: –OH and –H01:19

Diazonium Group Substitution: –OH and –H

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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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Directing Effect of Substituents: ortho–para-Directing Groups01:14

Directing Effect of Substituents: ortho–para-Directing Groups

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Ortho–para directors are substituent groups attached to the benzene ring and direct the addition of an electrophile to the positions ortho or para to the substituent. All electron-donating groups are considered ortho–para directors. They donate electrons to the ring and make the ring more electron-rich. The ring is therefore susceptible to the addition of electrophiles. Substituents such as amino, hydroxy, or alkoxy, containing lone pairs on the atom adjacent to the ring, donate...
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ortho–para-Directing Deactivators: Halogens01:24

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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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[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement01:21

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The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state.
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Funcionalizaciones de dirección transformables / modificables asistidas por grupos C

Bubul Das1,2, Nikita Chakraborty1, Bhisma K Patel1

  • 1Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India. patel@iitg.ac.in.

Organic & biomolecular chemistry
|August 26, 2025
PubMed
Resumen
Este resumen es generado por máquina.

Esta revisión explora los grupos de dirección transformables para la funcionalización C-H catalizada por metales. Estos grupos simplifican la síntesis evitando pasos de eliminación adicionales, lo que permite reacciones eficientes de una sola olla.

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Área de la Ciencia:

  • Química orgánica
  • Catálisis
  • Metodología sintética

Sus antecedentes:

  • Los grupos de dirección son cruciales para la funcionalización regioselectiva de C-H utilizando metales de transición.
  • Los métodos actuales a menudo requieren pasos adicionales para dirigir la eliminación del grupo, aumentando la complejidad sintética.

Objetivo del estudio:

  • Revisar los avances recientes en los grupos de dirección transformables/modificables para la funcionalización C-H.
  • Para resaltar su papel en la síntesis de un solo bote y paso económico de andamios orgánicos complejos.

Principales métodos:

  • Discusión de la literatura sobre la activación del C-H catalizado por metales de transición.
  • Centrarse en la dirección de grupos que pueden ser transformados o modificados después de la funcionalidad.
  • Análisis de las estrategias sintéticas de economía única y por etapas.

Principales resultados:

  • Los grupos de dirección transformables ofrecen una solución a la limitación de la eliminación posterior a la funcionalización.
  • Estos grupos pueden convertirse en otras funcionalidades en un solo bote o modificarse fácilmente.
  • Permite la síntesis de estructuras orgánicas complejas con mayor eficiencia.

Conclusiones:

  • Los grupos de dirección transformables mejoran significativamente la utilidad de la funcionalización C-H.
  • Simplifican las rutas sintéticas, reduciendo el número de pasos y el desperdicio.
  • Facilitar la construcción de intrincadas arquitecturas moleculares.