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Organic Oxidations Using Geomimicry.

Ziming Yang¹, Hilairy E Hartnett^1,2, Everett L Shock^1,2

¹The School of Molecular Sciences, Arizona State University , Tempe, Arizona 85287, United States.

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|November 13, 2015

Summary

Copper(II) chloride in water oxidizes organic compounds like phenylacetic acid to benzaldehyde under hydrothermal conditions. This green chemistry approach avoids toxic reagents and proceeds with high yields.

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Area of Science:

Green Chemistry
Hydrothermal Reactions
Oxidation Chemistry

Background:

Oxidation reactions are crucial in organic synthesis and geochemistry.
Traditional oxidation methods often employ toxic heavy metals and harsh conditions.
Hydrothermal conditions offer a unique environment for chemical transformations.

Purpose of the Study:

To investigate the oxidation of organic compounds using copper(II) chloride in water.
To explore reactions under geochemically relevant hydrothermal conditions (250 °C, 40 bar).
To propose plausible reaction mechanisms and assess the green chemistry aspects.

Main Methods:

Performing oxidation reactions of phenylacetic acid, benzyl alcohol, and benzaldehyde in water.
Utilizing copper(II) chloride as the sole oxidant.
Conducting speciation calculations to identify the active oxidizing species.
Analyzing reaction stoichiometries and substituent effects.

Main Results:

Successful oxidation of phenylacetic acid to benzaldehyde, benzyl alcohol to benzaldehyde, and benzaldehyde to benzoic acid.
Identification of copper(II)-carboxylate and copper(II)-chloride complexes as the active oxidants, not free copper(II) ions.
High chemical yields achieved under the studied hydrothermal conditions.

Conclusions:

Copper(II) chloride in water is an effective and green oxidant for specific organic transformations under hydrothermal conditions.
The study elucidates the role of complexed copper species in the oxidation mechanism.
These findings support the development of environmentally benign oxidation processes.