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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.

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.

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.

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

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

The cyclic form of l-nitro-arginine, a molecule with formula C(6)H(10)N(4)O(4), was studied. Researchers found two unique molecular structures with distinct conformations and hydrogen bonding patterns, forming chains.

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Area of Science:

Crystallography
Organic Chemistry
Molecular Structure

Background:

L-nitro-arginine is a cyclic compound with the chemical formula C(6)H(10)N(4)O(4).
Crystallization reveals the three-dimensional arrangement of atoms within a molecule.

Purpose of the Study:

To determine the crystal structure of the cyclic form of l-nitro-arginine.
To analyze the geometrical parameters and conformational differences of independent molecules.
To investigate the hydrogen bonding network within the crystal.

Main Methods:

Single-crystal X-ray diffraction was used to determine the crystal structure.
Geometrical parameters were analyzed to identify molecular conformations.
Hydrogen bonding interactions were characterized.

Main Results:

The asymmetric unit contains two independent molecules of cyclic l-nitro-arginine.
Both molecules correspond to l-2-nitrimino-1,3-diazepane-4-carboxylic acid.
Conformational differences were observed, with one molecule resembling a twisted chair and the other a flattened boat.
Six active hydrogen atoms participate in hydrogen bonds: two intramolecular and four intermolecular.
An infinite chain of molecules was formed along the b axis through intermolecular hydrogen bonds.

Conclusions:

The crystal structure of cyclic l-nitro-arginine reveals distinct molecular conformations and an extended hydrogen bonding network.
The study provides insights into the solid-state behavior and intermolecular interactions of this compound.
Understanding these structural features is crucial for potential applications in medicinal chemistry or materials science.