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Oxidation with vanadium pentoxide in aqueous sulphuric acid has certain limitations, mainly because of the instability of vanadosulphate complexes in aqueous media. Hence the possibility of use of less strongly dissociative solvents than water has been examined with a view to enhancing the stability and oxidizing power of these complexes. Some simple organic oxygen compounds (alcohols, aldehydes, ketones and acids) have been examined as reductants, together with some others (acetals and esters) which are difficult to study in aqueous media because of the hydrophobic character. The results show that alcohols are more resistant to attack in non-aqueous medium than in water, and that the longer-chain alcohols are more easily oxidized. The aldehydes are more difficult to oxidize than ketones, as is also the case in water. The acids, also as in water, react only very feebly. The use of non-aqueous media extends the range of oxidation with vanadate to some substances insoluble in water (such as epoxides) which display sufficient reactivity.
Pradeau
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Laboratoire de Chimie Analytique, Faculté des Sciences Phamaceutiques et Biologiques, Rue Jean-Baptiste Clément, 92290 Chatenay Malabry, France.
Hamon
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