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Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN1

Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic S_N1

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,...

Basicity of Heterocyclic Aromatic Amines

Basicity of Heterocyclic Aromatic Amines

Heterocyclic amines, where the N atom is a part of an alicyclic system, are similar in basicity to alkylamines. Interestingly, the heterocyclic amine having a nitrogen atom as part of an aromatic ring has much less basicity than its corresponding alicyclic counterpart. For this reason, as presented in Figure 1, piperidine (pKb = 2.8) is significantly more basic than pyridine (pKb = 8.8).

Aromatic Compounds: Overview

Aromatic Compounds: Overview

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...

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

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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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Arenediazonium substitution reactions occur when the diazonium group is substituted by various functional groups such as halides, hydroxyl, nitrile, etc. For instance, arenediazonium salts react with copper(I) salts of chloride, bromide, or cyanide to form corresponding aryl chlorides, bromides, and nitriles. These reactions are named Sandmeyer reactions. Although the mechanism of this reaction is complicated, as illustrated in Figure 1, they are believed to progress via an aryl copper...

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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Synthesis of Zeolites Using the ADOR Assembly-Disassembly-Organization-Reassembly Route

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Published on: April 3, 2016

Aromaticity in Ancient Zeise's Salt.

Ankur K Guha¹, Amlan J Kalita^1,2, Mesías Orozco-Ic³

¹Advanced Computational Chemistry Centre, Department of Chemistry, Cotton University, Panbazar, Guwahati, Assam 781001, India.

Inorganic Chemistry

|September 29, 2025

Summary

Zeise's salt, the first organometallic compound, exhibits significant σ-aromatic character. Electron delocalization calculations reveal a stable C-Pt-C ring, supporting its classification as a σ-aromatic metallacycle.

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Published on: August 25, 2016

Area of Science:

Organometallic Chemistry
Computational Chemistry
Solid-State Chemistry

Background:

Zeise's salt (K[C2H4PtCl3]·H2O) is the first synthesized organometallic compound.
Its electronic structure is traditionally explained by the Dewar-Chatt-Duncanson model.

Purpose of the Study:

To analyze the electronic structure and bonding of the Zeise's salt anion.
To investigate its potential σ-aromatic character and metallacycle stability.

Main Methods:

Magnetic response calculations.
Molecular orbital decomposition.
Energetic criteria using isodesmic reactions.
Electron delocalization analysis via EDDB_F method.

Main Results:

In-plane orbitals dominate, generating strong diatropic currents indicative of σ-aromaticity.
C-Pt-C ring formation is energetically favorable, suggesting significant delocalization.
1.8 |e| electrons are delocalized across the C-Pt-C fragment.

Conclusions:

Zeise's salt exhibits dominant σ-aromatic character.
The compound can be considered a σ-aromatic metallacycle due to favorable ring formation and electron delocalization.