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Oxidation of Phenols to Quinones

Oxidation of Phenols to Quinones

In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox property is crucial in...

Qualitative Analysis

Qualitative Analysis

For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
For instance, group IV...

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.

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.

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.

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Updated: Jun 1, 2026

Green Synthesis of Quinoline-Based Ionic Liquid

Green Synthesis of Quinoline-Based Ionic Liquid

Published on: September 27, 2024

5-Chloro-8-hydroxy-quinolinium nitrate.

¹Department of Chemistry, University of Malaya, 50603 Kuala Lumpur, Malaysia.

Acta Crystallographica. Section E, Structure Reports Online

|May 18, 2011

Summary

This summary is machine-generated.

The study examined the 5-chloro-8-hydroxy-quinolinium nitrate ion pair. Researchers found the cation and anion are nearly coplanar and form hydrogen bonds, creating a specific ring structure.

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Green Synthesis of Quinoline-Based Ionic Liquid

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Facile Preparation of 4-Substituted Quinazoline Derivatives

Facile Preparation of 4-Substituted Quinazoline Derivatives

Published on: February 15, 2016

Area of Science:

Crystallography
Chemical Physics
Molecular Structure

Background:

Understanding molecular interactions is crucial in chemistry.
Ion pairs play a significant role in crystal engineering and material science.
5-chloro-8-hydroxy-quinolinium derivatives have potential applications in various fields.

Purpose of the Study:

To investigate the crystal structure and intermolecular interactions of the 5-chloro-8-hydroxy-quinolinium nitrate ion pair.
To characterize the spatial arrangement and hydrogen bonding network within the crystal lattice.

Main Methods:

Single-crystal X-ray diffraction was used to determine the three-dimensional structure.
Analysis of bond lengths, bond angles, and intermolecular distances was performed.
Hydrogen bonding interactions were identified and quantified.

Main Results:

The 5-chloro-8-hydroxy-quinolinium cation and nitrate anion were found to be approximately coplanar, with a dihedral angle of 16.1(1)°.
Two ion pairs form a centrosymmetric hydrogen-bonded network, involving O-H⋯O and N-H⋯O interactions.
This network generates a characteristic R(4) (4)(14) ring motif.

Conclusions:

The study elucidates the detailed crystal structure and supramolecular assembly of the 5-chloro-8-hydroxy-quinolinium nitrate ion pair.
The observed hydrogen bonding pattern dictates the formation of a specific ring structure, contributing to crystal packing.
These findings provide insights into the solid-state behavior of quinolinium salts and their interactions.