Abstract
UV-photolysis of aqueous solution of 5-iodouracil in presence of cystamine and oxygen leads to isodialuric acid and 5-S-cysteamine-uracil. The yields of these procucts were determined as a function of cystamine concentration. In absence of oxygen but in presence of low concentration of cystamine another competition reaction in addition to the formation of 5-S-cysteamine-uracil is observed which leads to the formation of uracil dimer. UV-photolysis of iodouracil in presence of cysteamine and oxygen leads to isodialuric acid, 5-S-cysteamine-uracil and uracil. The results suggest that cystamine accounts for the formation of 5-S-cysteamine-uracil and cysteamine for the occurence of uracil. Iodouracil and cysteamine react at pH’s between 7 and 12 in a dark reaction to give uracil.
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