Photochemical Reactions of Uranyl Ions with Organic Compounds. I. The Mechanism of the Uranyl Ion-Photosensitized Oxidation of Lactic Acid

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The photochemical reaction of lactic acid with uranyl ions in an aqueous solution was studied with radiations of 4050 and 4360 Å. The quantum yields and molar ratios of the reaction products were measured under various conditions. Two competing photo-reactions appeared to take place; through them lactic acid was oxidized to form pyruvic acid at a lower pH and to form acetaldehyde, with an evolution of carbon dioxide, at a higher pH. The results obtained can be well explained by assuming that the excitation of the uranyl lactate complex is involved in the formation of acetaldehyde and that a collision between lactic acid and the excited uranyl ion, without any complex formation, is involved in the formation of pyruvic acid.
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