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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.

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

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

Nitrous acid and nitric acids are two types of acids containing nitrogen, among which nitrous acid is weaker than nitric acid. Nitrous acid with a pKa value of 3.37 ionizes in water to give a nitrite ion and the hydronium ion.
The nitrous acid is unstable. Hence, it is formed in situ from a solution of sodium nitrite and cold aqueous acids such as hydrochloric or sulfuric acid. In an acidic solution, the –OH group of nitrous acid undergoes protonation to give oxonium ion, followed by water loss...

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.

Nitriles to Carboxylic Acids: Hydrolysis

Nitriles to Carboxylic Acids: Hydrolysis

Nitriles undergo acid-catalyzed hydrolysis or base-catalyzed hydrolysis to form a carboxylic acid. These reactions proceed via an amide intermediate.

Carboxylic Acids to Methylesters: Alkylation using Diazomethane

Carboxylic Acids to Methylesters: Alkylation using Diazomethane

Carboxylic acids react with diazomethane in an ether solvent via alkylation at the carboxylate oxygen atom to give methyl esters of the corresponding acid with excellent yields.

Preparation of Carboxylic Acids: Hydrolysis of Nitriles

Preparation of Carboxylic Acids: Hydrolysis of Nitriles

Nitriles (R–CN) can be converted into carboxylic acids (R–COOH) upon treatment with aqueous acids, i.e., upon hydrolysis of nitriles. Under base-catalyzed conditions, carboxylate anions (R–COO−) are formed.

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Potassium l-2-nitrimino-1,3-diazepane-4-carboxyl-ate monohydrate.

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l-2-Nitrimino-1,3-diazepane-4-carboxylic acid monohydrate.

Harutyun A Karapetyan¹

¹Molecular Structure Research Center, National Academy of Sciences RA, Azatutyan Ave. 26, 375014 Yerevan, Republic of Armenia.

Acta Crystallographica. Section E, Structure Reports Online

|January 5, 2011

Summary

This study details the crystal structure of a hydrated compound, revealing similar geometric parameters and twist-boat conformations for its 1,3-diazepane rings. A 3D network is formed through extensive intra- and intermolecular hydrogen bonding.

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Area of Science:

Crystallography
Chemical structure analysis
Supramolecular chemistry

Background:

Understanding the solid-state structure of organic compounds is crucial for predicting their physical and chemical properties.
The 1,3-diazepane ring system is a key structural motif in various biologically active molecules.

Purpose of the Study:

To elucidate the detailed crystal structure of the title compound, C(6)H(10)N(4)O(4)·H(2)O.
To analyze the conformational preferences of the 1,3-diazepane rings within the crystal lattice.
To investigate the hydrogen bonding network and its role in stabilizing the crystal structure.

Main Methods:

Single-crystal X-ray diffraction was employed to determine the crystal structure.
Geometric parameters and bond distances/angles were analyzed.
Conformational analysis of the 1,3-diazepane rings was performed.
Hydrogen bonding interactions were identified and characterized.

Main Results:

The title compound crystallizes with two independent formula units in the asymmetric unit.
The geometric parameters of the two independent units are highly similar.
The 1,3-diazepane rings adopt a twist-boat conformation.
A three-dimensional hydrogen-bonded network is formed involving all ten O- and N-bound hydrogen atoms, with two intramolecular and eight intermolecular hydrogen bonds.

Conclusions:

The crystal structure provides fundamental insights into the solid-state behavior of this compound.
The observed twist-boat conformation of the 1,3-diazepane ring is a significant finding.
The extensive hydrogen bonding network dictates the overall crystal packing and stability.