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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...

IUPAC Nomenclature of Aldehydes

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Aldehydes are named based on the systematic nomenclature rules set by the IUPAC. For acyclic aldehydes, the longest carbon chain containing the aldehydic (–CHO) group is considered the parent chain. The aldehyde is named by replacing the last letter “e” in the hydrocarbon name with “al”. For instance, a simple, seven-carbon-membered acyclic aldehyde is called heptanal, derived from heptane. The carbon chain is numbered starting from the aldehydic carbon, although the aldehydic carbon’s locant...

Five-Membered Heterocyclic Aromatic Compounds: Overview

Five-Membered Heterocyclic Aromatic Compounds: Overview

Heterocyclic aromatic compounds are cyclic compounds that are aromatic and have one or more heteroatoms—atoms other than carbon, in the ring. Depending upon the number of atoms present in the ring, they can be either five or six-membered. Examples of five-membered heterocyclic aromatic compounds include pyrrole, furan, thiophene, and imidazole. Pyrrole consists of one nitrogen atom having one lone pair of electrons. Furan and thiophene have one oxygen and one sulfur heteroatom, respectively.

UV–Vis Spectroscopy: Woodward–Fieser Rules

UV–Vis Spectroscopy: Woodward–Fieser Rules

UV–Visible absorption spectra of conjugated dienes arise from the lowest energy π&VeryThinSpace;→&VeryThinSpace;π* transitions. The light-absorbing part of the molecule is called the chromophore, and the substituents directly attached to the chromophore are called auxochromes. A strong correlation exists between the absorption maxima, λmax, and the structure of a conjugated π system. The Woodward–Fieser rules predict the value of λmax for a given structure by adding the contributions...

Preparation of Epoxides

Preparation of Epoxides

Overview
Epoxides result from alkene oxidation, which can be achieved by a) air, b) peroxy acids, c) hypochlorous acids, and d) halohydrin cyclization.
Epoxidation with Peroxy Acids
Epoxidation of alkenes via oxidation with peroxy acids involves the conversion of a carbon–carbon double bond to an epoxide using the oxidizing agent meta-chloroperoxybenzoic acid, commonly known as MCPBA. Since the O–O bond of peroxy acids is very weak, the addition of electrophilic oxygen of peroxy acids to...

ortho–para-Directing Activators: –CH3, –OH, –&NoBreak;NH2, –OCH3

ortho–para-Directing Activators: –CH₃, –OH, –⁠NH₂, –OCH₃

All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...

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Acta Crystallographica. Section E, Structure Reports Online

|May 18, 2011

Summary

This study details the molecular structure of a C(15)H(8)O(4) compound, revealing an approximately planar molecule. Key findings include an intramolecular hydrogen bond between hydroxyl and formyl groups within the crystal structure.

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Area of Science:

Crystallography
Organic Chemistry
Molecular Structure

Background:

Understanding the three-dimensional arrangement of atoms in organic molecules is crucial for predicting their properties and reactivity.
Intramolecular hydrogen bonding plays a significant role in stabilizing molecular conformations and influencing chemical behavior.

Purpose of the Study:

To elucidate the crystal structure of the title compound, C(15)H(8)O(4).
To identify and characterize key structural features, including planarity and hydrogen bonding interactions.

Main Methods:

Single-crystal X-ray diffraction analysis was employed to determine the molecular and crystal structure.
The crystal structure was solved and refined, accounting for twinning.

Main Results:

The molecule C(15)H(8)O(4) was found to be approximately planar.
An intramolecular hydrogen bond was identified between the hydroxyl (-OH) and formyl (-CHO) groups.
The crystal exhibited non-merohedral twinning with a minor component of 15.9%.

Conclusions:

The study provides a detailed structural characterization of the C(15)H(8)O(4) molecule.
The observed intramolecular hydrogen bond likely contributes to the molecule's stability and planarity.
The presence of crystal twinning was noted and managed during structural analysis.