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The reversible oxidation of aromatic cation radicals to dications. Solvents of low nucleophilicity

✍ Scribed by Ole Hammerich; Vernon D. Parker

Publisher
Elsevier Science
Year
1973
Tongue
English
Weight
521 KB
Volume
18
Category
Article
ISSN
0013-4686

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✦ Synopsis

Reversible behavior for both electron transfers for oxidation of aromatic compounds to cation radicals and dications was observed in several common electrolytic solvents. Nitriles, nitro compounds and dichloromethane can all be rendered essentially nucleophile free for voltammetric purposes simply by conducting the voltammetric measurements over neutral alumina shortly after the mixture has been stirred. Solvents containing trifluoroacetic acid and the corresponding acid anhydride are not only useful for vohammetry but can also be used to prepare stable solutions of cation radicals and dications.

Equilibrium constants for the disproportionation of cation radicals to dications were calculated from the reversibie electrode potentials and the effect of changes in the solvent system on the equilibrium constants is discussed.

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