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Acidity and Basicity of Alcohols and Phenols

Acidity and Basicity of Alcohols and Phenols

Like water, alcohols are weak acids and bases. This is attributed to the polarization of the O–H bond making the hydrogen partially positive. Moreover, the electron pairs on the oxygen atom of alcohol make it both basic and nucleophilic. Protonation of an alcohol converts hydroxide, a poor leaving group, into water—a good one. The two acid–base equilibria corresponding to ethanol are depicted below.

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...

Structure and Nomenclature of Alcohols and Phenols

Structure and Nomenclature of Alcohols and Phenols

Overview
Alcohols are one of the most important functional groups in organic chemistry. The name of alcohol comes from the hydrocarbon from which it is derived. Alcohols are organic molecules containing the functional hydroxyl or –OH group directly bonded to carbon. Phenols have an OH group directly attached to a benzene ring. While alcohols are colorless, phenol is a white crystalline compound with a characteristic "hospital smell" odor.
As with other organic compounds, alcohols and phenols...

Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids

Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids

Diols are compounds with two hydroxyl groups. In addition to syn dihydroxylation, diols can also be synthesized through the process of anti dihydroxylation. The process involves treating an alkene with a peroxycarboxylic acid to form an epoxide. Epoxides are highly strained three-membered rings with oxygen and two carbons occupying the corners of an equilateral triangle. This step is followed by ring-opening of the epoxide in the presence of an aqueous acid to give a trans diol.

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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Related Experiment Video

Updated: Jun 1, 2026

Protocol for the Synthesis of Ortho-trifluoromethoxylated Aniline Derivatives

Protocol for the Synthesis of Ortho-trifluoromethoxylated Aniline Derivatives

Published on: January 19, 2016

3-Hydr-oxy-4-nitro-phenyl acetate.

Chao Liu, Chunqing Cheng, Xiujie Ji

Acta Crystallographica. Section E, Structure Reports Online

|May 18, 2011

Summary

This summary is machine-generated.

This study details the molecular structure of a specific acetate compound. It reveals intramolecular hydrogen bonding forming a non-planar ring and intermolecular bonds linking molecules in the crystal structure.

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Area of Science:

Crystallography
Molecular Chemistry
Organic Chemistry

Background:

Understanding molecular interactions and conformations is crucial in organic chemistry.
Acetate groups and aromatic rings are common structural motifs in various compounds.
Hydrogen bonding plays a significant role in crystal packing and molecular stability.

Purpose of the Study:

To elucidate the precise three-dimensional structure of the title compound, C(8)H(7)NO(5).
To investigate the nature and geometry of intramolecular and intermolecular interactions within the crystal lattice.
To characterize the conformational preferences of the acetate group relative to the aromatic ring.

Main Methods:

Single-crystal X-ray diffraction was employed to determine the molecular and crystal structure.
Analysis of bond lengths, bond angles, and dihedral angles provided geometric details.
Identification and analysis of hydrogen bonding networks (O-H⋯O and C-H⋯O) were performed.

Main Results:

The acetate group is oriented at a dihedral angle of 85.30(3)° with respect to the aromatic ring.
An intramolecular O-H⋯O hydrogen bond was observed, forming a non-planar six-membered ring with an envelope conformation.
Intermolecular C-H⋯O hydrogen bonds were identified, mediating the linkage of molecules in the crystal structure.

Conclusions:

The crystal structure of C(8)H(7)NO(5) is stabilized by a combination of intramolecular and intermolecular hydrogen bonding.
The observed conformation and hydrogen bonding patterns provide insights into the packing forces governing the solid state of this compound.
This structural characterization contributes to the broader understanding of structure-property relationships in organic molecules.