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2° Amines to N-Nitrosamines: Reaction with NaNO2

2° Amines to N-Nitrosamines: Reaction with NaNO₂

Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.

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 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.

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.

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.

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(E)-2,3-Dimethyl-N-(2-nitro-benzyl-idene)aniline.

M Nawaz Tahir, Muhammad Ilyas Tariq, Shahbaz Ahmad

Acta Crystallographica. Section E, Structure Reports Online

|May 19, 2011

Summary

This study characterizes a novel organic compound, C(15)H(14)N(2)O(2), detailing its molecular structure and crystal packing. The research reveals specific bond angles and intermolecular interactions, including C-H⋯O and π-π stacking, influencing its crystalline form.

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Area of Science:

Organic Chemistry
Crystallography
Supramolecular Chemistry

Background:

Understanding the structure-property relationships of organic molecules is crucial in materials science.
Crystal engineering relies on predicting and controlling intermolecular interactions to design novel materials.

Purpose of the Study:

To elucidate the detailed molecular and crystal structure of the title compound, C(15)H(14)N(2)O(2).
To investigate the intermolecular interactions governing the crystal packing and the formation of polymeric chains.

Main Methods:

Single-crystal X-ray diffraction analysis was employed to determine the three-dimensional molecular structure.
Analysis of bond lengths, bond angles, dihedral angles, and intermolecular contacts (C-H⋯O, C-H⋯π, π-π stacking) was performed.
Identification of disordered atomic sites, specifically for the ortho-methyl group hydrogens.

Main Results:

The molecule exhibits planar anilinic and benzaldehyde groups with a specific dihedral angle of 11.69°.
The nitro group is inclined at 34.02° to the benzaldehyde group, and the molecule has an E configuration about the C=N bond.
Crystal packing is characterized by zigzag polymeric chains formed via C-H⋯O interactions and further stabilized by C-H⋯π and π-π interactions between aromatic rings.

Conclusions:

The study provides a comprehensive structural characterization of C(15)H(14)N(2)O(2), highlighting the interplay of intramolecular geometry and intermolecular forces.
The identified intermolecular interactions, including hydrogen bonding and π-π stacking, are key determinants of the observed crystal structure and chain formation.