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UV-Photolysis of aqueous solution of 5-iodouracil in presence of oxygen and methanol leads quantitatively to isodialuric acid, uracil, formaldehyde, H 2 O 2  and iodine. The yields of these products were determined as a function of methanol concentration. The results suggest that the primary step is the homolytic splitting of the C-I-bond. The reaction of the uracil radical with methanol gives uracil and a CH 2 OH-radical, and with oxygen isodialuric acid. The uracil radical reacts 24 times faster with oxygen than with methanol. The reaction of CH 2 OH-radical with oxygen gives formaldehyde and H 2 O 2 .

zeitschrift für naturforschung b

Photolyse von 5-Joduracil in wäßriger, sauerstoffgesättigter Lösung in Gegenwart von Methanol / Photochemistry of 5-Iodouracil in Aqueous Solution in Presence of Oxygen and Methanol