Photochemistry of Nucleic Acids and Related Compounds. I. The First Step in the Ultraviolet Irradiation of 1,3-Dimethyluracil1,2

The first isolated product of the ultraviolet irradiation of 1,3- dimethyluracil was identified by synthesis as 6-hydroxyl-1,3-dimethylhydrouracil. 5-Hydroxy1,3-dimethylhydrouracil was eliminated as a possible intermediate in this process. A mechanism for this process was proposed. (auth)