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Related Concept Videos

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

ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH3

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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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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

ortho–para-Directing Deactivators: Halogens

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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...
6.6K
Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration02:34

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

9.5K
The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
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Directing Effect of Substituents: meta-Directing Groups01:09

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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...
5.8K
meta-Directing Deactivators: –NO2, –CN, –CHO, –⁠CO2R, –COR, –CO2H01:13

meta-Directing Deactivators: –NO2, –CN, –CHO, –⁠CO2R, –COR, –CO2H

6.5K
All meta-directing substituents are deactivating groups. These substituents withdraw electrons from the aromatic ring, making the ring less reactive toward electrophilic substitution. For example, the nitration of nitrobenzene is 100,000 times slower than that of benzene because of the deactivating effect of the nitro group. The first step in an electrophilic aromatic substitution is the addition of an electrophile to form a resonance-stabilized carbocation. The energy diagrams for...
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Monodentate Transient Directing Group Enabled Distal C─H Bond Functionalization in Ferrocenecarboxaldehyde.

Ashwini Dilip Dhumale1, Devendra Parganiha1, Shilpi Bhardwaj1

  • 1Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal, Madhya Pradesh, India.

Chemistry, an Asian Journal
|January 14, 2026
PubMed
Summary

This study introduces a new method for distal C-H activation using palladium migration, facilitated by a transient directing group. This approach enables efficient heteroannular C-H functionalization of ferrocenecarboxaldehydes.

Keywords:
alkenylationdistal C–H activationferrocenesligand accelerationpalladium catalysis

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Area of Science:

  • Organometallic Chemistry
  • Catalysis
  • Synthetic Organic Chemistry

Background:

  • Distal C-H activation is crucial for complex molecule synthesis.
  • Palladium migration on stacked molecules is a key strategy for C-H activation.
  • Transient directing groups (TDGs) can enable palladacycle formation for migration.

Purpose of the Study:

  • To develop a method for distal C-H functionalization using heteroannular palladium migration.
  • To investigate the role of monodentate TDGs and ligands in fine-tuning palladium migration.
  • To demonstrate the efficacy of this method on ferrocenecarboxaldehydes.

Main Methods:

  • Utilized a monodentate transient directing group (TDG) and an additional ligand.
  • Investigated palladium migration pathways through control experiments.
  • Applied the developed method to synthesize functionalized ferrocenecarboxaldehydes.

Main Results:

  • Successfully achieved distal heteroannular C-H functionalization of ferrocenecarboxaldehydes.
  • Demonstrated 23 examples of this novel functionalization.
  • Showcased the fine-tuning of palladium migration via TDG and ligand selection.

Conclusions:

  • Monodentate TDG-enabled heteroannular palladium migration is a viable strategy for distal C-H activation.
  • This method offers a new route for functionalizing ferrocenecarboxaldehydes.
  • The approach provides an alternative to template-designed C-H activation strategies.