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Aryldiazonium Salts to Azo Dyes: Diazo Coupling

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

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 position.

Diazonium Group Substitution: –OH and –H

Diazonium Group Substitution: –OH and –H

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.

α-Bromination of Carboxylic Acids: Hell–Volhard–Zelinski Reaction

α-Bromination of Carboxylic Acids: Hell–Volhard–Zelinski Reaction

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 bromine molecule...

Sulfur Assimilation

Sulfur Assimilation

Sulfur is an essential element in biological systems, contributing to synthesizing key biomolecules, including amino acids such as cysteine and methionine, and cofactors such as coenzyme A and biotin. Microorganisms primarily assimilate sulfur as sulfate (SO₄²⁻) from the environment, which must undergo a series of biochemical transformations before it can be incorporated into cellular components. As sulfate is highly oxidized, it must undergo assimilatory sulfate reduction to become...

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO2 Mechanism

1° Amines to Diazonium or Aryldiazonium Salts: Diazotization with NaNO₂ Mechanism

Nitrous acid is a relatively weak and unstable acid prepared in situ by the reaction of sodium nitrite and cold, dilute hydrochloric acid. In an acidic solution, the nitrous acid undergoes protonation when it loses water to form a nitrosonium ion—an electrophile. Nitrous acid reacts with primary amines to give diazonium salts. The reaction is called diazotization of primary amines.

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, or cyano...

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Synthesis of 1,2-Azaborines and the Preparation of Their Protein Complexes with T4 Lysozyme Mutants

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Beta-Zn(3)(AsO(3))(2).

William T A Harrison¹

¹Department of Chemistry, University of Aberdeen, Meston Walk, Aberdeen AB24 3UE, Scotland. w.harrison@abdn.ac.uk

Acta Crystallographica. Section C, Crystal Structure Communications

|June 5, 2010

Summary

This summary is machine-generated.

Trizinc(II) diarsenite features distorted ZnO(4) tetrahedra and AsO(3) trigonal pyramids forming a unique 3D network. This polymorph of reinerite exhibits unusual edge-sharing tetrahedra and eight-ring channels.

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Area of Science:

Crystal structure analysis
Inorganic chemistry
Mineralogy

Background:

The title compound, trizinc(II) diarsenite, is a polymorph of the mineral reinerite.
Understanding the structural characteristics of such compounds is crucial for materials science and geochemistry.

Purpose of the Study:

To elucidate the crystal structure of trizinc(II) diarsenite.
To identify key structural features and compare them with related minerals.

Main Methods:

Single-crystal X-ray diffraction was used to determine the atomic arrangement.
Structural analysis focused on coordination polyhedra and network topology.

Main Results:

The structure is composed of highly distorted ZnO(4) tetrahedra and AsO(3) trigonal pyramids.
A three-dimensional network is formed through unusual edge-sharing tetrahedra, with a short Zn-Zn separation of 2.903 Å.
Eight-ring pseudo-channels containing As(III) lone pairs were identified.

Conclusions:

The detailed crystal structure of trizinc(II) diarsenite has been determined.
The compound exhibits unique structural motifs, including edge-sharing tetrahedra and channels influenced by lone pairs.
Its relationship as a polymorph to reinerite highlights structural diversity in zinc arsenites.