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UV-Photolysis (254 nm) of 5-bromouracil in aqueous solution in the presence of oxygen was investigated at pH = 6. Isodialuric acid and 4,5-dihydroxy-imidazolidone-2 as a secondary photoproduct were identified. The bromine atom from the homolytic splitting of the C-Br-bond and molecular bromine have no effect on the product distribution under our experimental conditions. In the presence of 2-deoxy-D-ribose and oxygen the UV-photolysis of bromo-uracil leads to uracil, isodialuric acid and 4,5-dihydroxy imidazolidone-2. The yield of uracil increases with increasing deoxy-D-ribose concentration while the yield of isodialuric acid and 4,5-dihydroxy-imidazolidone decreases.

zeitschrift für naturforschung b

UV-Photolyse von 5-Bromuracil in wäßriger Lösung / UV-Photolysis of 5-Bromouracil in Aqueous Solution: Einfluß von Sauerstoff und Desoxy-ᴅ-ribose / Influence of Oxygen and Deoxy-ᴅ-ribose