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Oxidation of Alcohols

Oxidation of Alcohols

In this lesson, the oxidation of alcohols is discussed in depth. The various reagents used for oxidation of primary and secondary alcohols are detailed, and their mechanism of action is provided.
The process of oxidation in a chemical reaction is observed in any of the three forms:

Oxidative Cleavage of Alkenes: Ozonolysis

Oxidative Cleavage of Alkenes: Ozonolysis

In ozonolysis, ozone is used to cleave a carbon–carbon double bond to form aldehydes and ketones, or carboxylic acids, depending on the work-up.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.

Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate

Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate

Alkenes can be dihydroxylated using potassium permanganate. The method encompasses the reaction of an alkene with a cold, dilute solution of potassium permanganate under basic conditions to form a cis-diol along with a brown precipitate of manganese dioxide.

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.

Aldehydes and Ketones with Alcohols: Hemiacetal Formation

Aldehydes and Ketones with Alcohols: Hemiacetal Formation

Similar to water, alcohols can add to the carbonyl carbon of the aldehydes and ketones. The addition of one molecule of alcohol to the carbonyl compound forms the hemiacetal or half acetal. As depicted below, in a hemiacetal, the carbon is directly linked to an OH and OR group.

Reactions at the Benzylic Position: Oxidation and Reduction

Reactions at the Benzylic Position: Oxidation and Reduction

The benzylic position describes the position of a carbon atom attached directly to a benzene ring. Benzene by itself does not undergo oxidation. In contrast, the benzylic carbon is quite reactive in the presence of strong oxidizing agents such as KMnO4 or H2CrO4. Therefore, alkylbenzenes are readily oxidized to benzoic acid, irrespective of the type of alkyl groups.

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Related Experiment Video

Updated: May 9, 2025

Monitoring the Reductive and Oxidative Half-Reactions of a Flavin-Dependent Monooxygenase using Stopped-Flow Spectrophotometry

Monitoring the Reductive and Oxidative Half-Reactions of a Flavin-Dependent Monooxygenase using Stopped-Flow Spectrophotometry

Published on: March 18, 2012

Tuning Reactivity in Cu/TEMPO Catalyzed Alcohol Oxidation Reactions.

Maximilian Schütze¹, Matthias Jux¹, Beatrice Cula¹

¹Institut für Chemie, Humboldt-Universität zu Berlin, Brook-Taylor-Straße 2, Berlin, 12489, Germany.

Chemistry, an Asian Journal

|April 30, 2025

Summary

New copper catalysts efficiently oxidize alcohols to aldehydes using molecular oxygen. One new system, Cu^IL3/TEMPO, achieves this without N-methyl imidazole, demonstrating improved catalytic activity and mechanistic insights into O2 activation.

Keywords:

Aerobic alcohol oxidation Bioinorganic chemistry Copper(I) complex Oxygen activation Spectroscopy

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Published on: June 20, 2014

Area of Science:

Coordination Chemistry
Catalysis
Organic Synthesis

Background:

Dinuclear copper(I) complexes with benzimidazole and imino donors catalyze alcohol oxidation.
Mechanistic studies identified Cu(III)2(bis-μ-oxo) and Cu(II)2(bis-μ-hydroxo) intermediates.

Purpose of the Study:

To design and synthesize new ligand systems (L3 and L4) to modify copper complex electronics.
To investigate the effect of these modifications on O2 activation and catalytic performance.

Main Methods:

Synthesis of dinuclear copper(I) complexes with novel ligands L3 and L4.
Catalytic testing for aerobic oxidation of alcohols to aldehydes using TEMPO and NMI.
Spectroscopic and mechanistic studies to probe O2 activation pathways.

Main Results:

The Cu^IL3 complex, despite a mononuclear core, utilizes a dinuclear O2 activation pathway, yielding good alcohol oxidation results.
The Cu^IL3/TEMPO system shows high efficiency and turnover numbers, even without NMI.
The Cu^I2L42 complex displays reduced activity due to the instability of the Cu(III)2(bis-μ-oxo) intermediate.

Conclusions:

Ligand design significantly impacts copper complex stability and catalytic activity in aerobic oxidation.
The Cu^IL3 ligand facilitates efficient alcohol oxidation, highlighting a tunable O2 activation mechanism.