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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...

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.

Basicity of Heterocyclic Aromatic Amines

Basicity of Heterocyclic Aromatic Amines

Heterocyclic amines, where the N atom is a part of an alicyclic system, are similar in basicity to alkylamines. Interestingly, the heterocyclic amine having a nitrogen atom as part of an aromatic ring has much less basicity than its corresponding alicyclic counterpart. For this reason, as presented in Figure 1, piperidine (pKb = 2.8) is significantly more basic than pyridine (pKb = 8.8).

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.

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2,4,6-Trimethyl-pyridinium nitrate.

Shahzad Sharif, Mehmet Akkurt, Islam Ullah Khan

Acta Crystallographica. Section E, Structure Reports Online

|May 19, 2011

Summary

This study details the crystal structure of a novel compound, revealing specific molecular arrangements and intermolecular interactions. The findings contribute to understanding chemical bonding and crystal packing in related materials.

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Palladium N-Heterocyclic Carbene Complexes: Synthesis from Benzimidazolium Salts and Catalytic Activity in Carbon-carbon Bond-forming Reactions

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Published on: July 30, 2017

Area of Science:

Crystallography
Solid-state chemistry

Background:

Understanding the crystal structure of organic salts is crucial for predicting their physical and chemical properties.
Intermolecular interactions dictate crystal packing and material stability.

Purpose of the Study:

To elucidate the crystal structure of the title compound, C(8)H(12)N(+)·NO(3) (-).
To identify and analyze the intermolecular interactions present in the crystal lattice.

Main Methods:

Single-crystal X-ray diffraction was employed to determine the molecular and crystal structure.
Analysis of hydrogen bonding and other non-covalent interactions was performed.

Main Results:

The crystal structure was solved, revealing the arrangement of the organic cation and nitrate anion.
The cation was found to lie on a mirror plane with specific symmetry elements.
N-H⋯O hydrogen bonds along the b axis and a short N-O⋯π contact were identified.

Conclusions:

The determined crystal structure provides a detailed molecular-level understanding of the title compound.
The identified intermolecular interactions are key to the observed crystal packing and stability.
This structural data serves as a foundation for further investigations into the properties and applications of this class of compounds.