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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.

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.

Preparation of 1° Amines: Hofmann and Curtius Rearrangement Overview

Preparation of 1° Amines: Hofmann and Curtius Rearrangement Overview

In the presence of an aqueous base and a halogen, primary amides can lose the carbonyl (as carbon dioxide) and undergo rearrangement to form primary amines. This reaction, called the Hofmann rearrangement, can produce primary amines (aryl and alkyl) in high yields without contamination by secondary and tertiary amines.

Nomenclature of Aryl and Heterocyclic Amines

Nomenclature of Aryl and Heterocyclic Amines

The simplest aromatic amine is phenylamine, which contains an –NH2 functionality directly attached to an aromatic ring. The name aniline is designated for this skeleton. As shown in Figure 1, the common names of the functionalized anilines involve prefixes ortho-, meta-, and para- to indicate the substitution position. Different functionalized aniline derivatives also have notable trivial names.

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.

Nomenclature of Primary Amines

Nomenclature of Primary Amines

Primary, secondary, and tertiary amines are compounds consisting of one, two, and three alkyl groups connected to the amino group (–NH2), respectively. As depicted in Figure 1, the common name of the primary amines is obtained by adding the suffix -amine to the alkyl substituent attached to the amino group as the corresponding alkylamine.

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5,6-Dimethyl-1,2,4-triazin-3-amine.

Man-Hua Wu, Qi-Ming Qiu, Sen Gao

Acta Crystallographica. Section E, Structure Reports Online

|January 20, 2012

Summary

This study details the crystal structure of C(5)H(8)N(4), revealing how molecules connect via hydrogen bonds to form zigzag chains and specific R(2)(2)(8) motifs. These findings enhance understanding of molecular assembly in crystalline solids.

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Area of Science:

Crystallography
Chemical Physics
Materials Science

Background:

Understanding intermolecular forces is crucial for predicting material properties.
Hydrogen bonding plays a significant role in the self-assembly of molecules.
The crystal structure of organic compounds dictates their physical and chemical behaviors.

Purpose of the Study:

To elucidate the crystal structure of the title compound, C(5)H(8)N(4).
To investigate the specific hydrogen bonding interactions present in the crystal lattice.
To characterize the supramolecular architecture formed by these interactions.

Main Methods:

Single-crystal X-ray diffraction was employed to determine the three-dimensional structure.
Analysis of intermolecular distances and angles identified hydrogen bonding networks.
Topological analysis was used to classify the observed hydrogen bond motifs.

Main Results:

The crystal structure of C(5)H(8)N(4) was successfully determined.
Adjacent molecules form zigzag chains along the [100] direction through N-H⋯N hydrogen bonds.
Amino and heterocyclic nitrogen atoms participate in further N-H⋯N hydrogen bonds, creating R(2)(2)(8) motifs.

Conclusions:

The crystal packing of C(5)H(8)N(4) is dominated by a network of N-H⋯N hydrogen bonds.
The identified zigzag chains and R(2)(2)(8) motifs provide insights into the supramolecular assembly.
This structural information is fundamental for potential applications in materials science and crystal engineering.