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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.

Nomenclature of Carboxylic Acid Derivatives: Amides and Nitriles

Nomenclature of Carboxylic Acid Derivatives: Amides and Nitriles

Naming Amides
The IUPAC and common names of amides are derived from the parent carboxylic acid, by replacing the suffix “oic acid” and “ic acid,” respectively, with “amide.” In the following example, the IUPAC name ethanamide is derived from ethanoic acid, and the common name, acetamide, is obtained from acetic acid.

Nitrosation of Enols

Nitrosation of Enols

The nitrosation reaction is one of the methods of preparing 1,2-diketones. The enol tautomer of the starting ketone reacts with sodium nitrite in hydrochloric acid, generating the 1,2-diketone after hydrolysis.

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.

Electrophilic Aromatic Substitution: Nitration of Benzene

Electrophilic Aromatic Substitution: Nitration of Benzene

The nitration of benzene is an example of an electrophilic aromatic substitution reaction. It involves the formation of a very powerful electrophile, the nitronium ion, which is linear in shape. The reaction occurs through the interaction of two strong acids, sulfuric and nitric acid.

Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions

Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions

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...

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¹School of Chemical Engineering, University of Science and Technology Liaoning, Anshan 114051, People's Republic of China.

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Summary

This study details the crystal structure of a novel bromo-pyridine derivative, C(14)H(12)BrN(3)O(2). The compound features two independent molecules linked by intermolecular hydrogen bonds, forming crystal chains.

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Area of Science:

Crystallography
Organic Chemistry
Materials Science

Background:

Understanding molecular interactions is crucial for designing new materials.
Bromo-pyridine derivatives are important scaffolds in medicinal chemistry and materials science.
Detailed structural analysis provides insights into intermolecular forces.

Purpose of the Study:

To elucidate the crystal structure of the title compound, C(14)H(12)BrN(3)O(2).
To investigate the molecular conformation and intermolecular interactions within the crystal lattice.
To provide a foundation for further studies on related bromo-pyridine compounds.

Main Methods:

Single-crystal X-ray diffraction was employed to determine the crystal structure.
The asymmetric unit was analyzed, revealing two independent molecules.
Intermolecular interactions, specifically hydrogen bonding, were identified and characterized.

Main Results:

The crystal structure of C(14)H(12)BrN(3)O(2) was determined.
Two independent molecules were observed in the asymmetric unit with dihedral angles of 24.4(6)° and 23.7(6)° between the benzene and pyridine rings.
Trans configuration was noted around the methylidene units, and N-H⋯O hydrogen bonds formed chains along the a axis.

Conclusions:

The study successfully characterized the crystal structure and intermolecular hydrogen bonding of C(14)H(12)BrN(3)O(2).
The observed crystal packing suggests potential for self-assembly and ordered structures.
These findings contribute to the understanding of structure-property relationships in bromo-pyridine systems.