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Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN101:14

Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN1

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Treating arylamines with nitrous acid gives aryldiazonium salts that are effective substrates in nucleophilic aromatic substitution reactions. The diazonio group in these salts can be easily displaced by different nucleophiles, yielding a wide variety of substituted benzenes. The leaving group departs as nitrogen gas, and this easy elimination is the driving force for the substitution reaction.
In the Sandmeyer reaction, for example, the diazonio group is replaced by a chloro, bromo,...
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Aromatic Compounds: Overview01:25

Aromatic Compounds: Overview

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In general, the term ‘aromatic’ indicates a pleasant smell or fragrance from fresh flowers, freshly prepared coffee, etc. In the early history of organic chemistry, many benzene derivatives were isolated from the pleasant odor oils of the plants. For example, vanillin was isolated from the oil of vanilla, methyl salicylate from the oil of wintergreen, and cinnamaldehyde from the oil of cinnamon. They all had a pleasant odor; hence the name aromatic was given.
In 1825, Faraday isolated...
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Basicity of Aromatic Amines01:18

Basicity of Aromatic Amines

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The basicity of aromatic amines is much weaker than that of aliphatic amines due to the involvement of the lone pair of electrons over the N atom in resonance with the aryl rings. Generally, the electron-donating ability of any substituents on the aryl ring of aromatic amines increases the basicity of the amine by increasing electron density, and hence the availability of lone pair on the nitrogen. On the other hand, electron-withdrawing functional groups on the aryl ring of amines decrease the...
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Nomenclature of Aromatic Compounds with a Single Substituent01:23

Nomenclature of Aromatic Compounds with a Single Substituent

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Benzene is the simplest aromatic hydrocarbon or arene. The IUPAC names for simple monosubstituted benzene derivatives are derived by adding the substituent's name as a prefix to the parent benzene. For example, halobenzene, where the halogen could be fluoro (F), chloro (Cl), bromo (Br), and iodo (I).
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Five-Membered Heterocyclic Aromatic Compounds: Overview01:13

Five-Membered Heterocyclic Aromatic Compounds: Overview

5.3K
Heterocyclic aromatic compounds are cyclic compounds that are aromatic and have one or more heteroatoms—atoms other than carbon, in the ring. Depending upon the number of atoms present in the ring, they can be either five or six-membered. Examples of five-membered heterocyclic aromatic compounds include pyrrole, furan, thiophene, and imidazole. Pyrrole consists of one nitrogen atom having one lone pair of electrons. Furan and thiophene have one oxygen and one sulfur heteroatom,...
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Nucleophilic Aromatic Substitution: Addition–Elimination (SNAr)01:30

Nucleophilic Aromatic Substitution: Addition–Elimination (SNAr)

4.6K
Nucleophilic substitution in aromatic compounds is feasible in substrates bearing strong electron-withdrawing substituents positioned ortho or para to the leaving group. The reaction proceeds via two steps: the addition of the nucleophile and the elimination of the leaving group.
The reaction begins with an attack of the nucleophile on the carbon that holds the leaving group. This results in the delocalization of the π electrons over the ring carbons. The resonance interaction between...
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Related Experiment Video

Updated: Jan 19, 2026

Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN1
01:14

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A Stable Aromatic Tetrasilacyclobutadiene Dication.

Xiaofei Sun1, Thomas Simler1, Ravi Yadav1

  • 1Institut für Anorganische Chemie, Karlsruher Institut für Technologie (KIT) , Engesserstrasse 15 , 76131 Karlsruhe , Germany.

Journal of the American Chemical Society
|September 12, 2019
PubMed
Summary
This summary is machine-generated.

Researchers synthesized and characterized the first silicon analogue of aromatic cyclobutadiene dication. This novel 2π-electron tetrasilacyclobutadiene dication exhibits a square-planar geometry, confirming its aromaticity.

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Area of Science:

  • Organosilicon Chemistry
  • Aromaticity Studies
  • Inorganic Synthesis

Background:

  • Cyclobutadiene dications are fundamental aromatic systems, but their silicon analogues remain elusive.
  • Understanding silicon's role in aromaticity provides insights into bonding and electronic structures.

Purpose of the Study:

  • To synthesize and characterize the first silicon-based analogue of the aromatic cyclobutadiene dication.
  • To investigate the structural and electronic properties of this novel silicon cluster.

Main Methods:

  • A straightforward synthesis involving [LSiCl], [LSISiL], and NaBPh4.
  • Full characterization including molecular structure determination.
  • Theoretical calculations to support electronic structure interpretation.

Main Results:

  • Successful isolation and characterization of the tetrasilacyclobutadiene dication, [(LSi)4](BPh4)2.
  • The structure reveals a four-membered Si4 ring with a near square-planar geometry.
  • Theoretical calculations confirm a 2π-electron aromatic system with a singlet ground state.

Conclusions:

  • The first silicon analogue of an aromatic cyclobutadiene dication has been synthesized.
  • The compound exhibits classical 2π-aromaticity, expanding the scope of aromatic systems.
  • This work opens new avenues for exploring silicon-based aromatic compounds.