The photodimerization of 1,3-dimethyluracil in a variety of organic solvents is described. The reactions lead to the formation of the four possible cyclobutane-type dimers, the relative amounts depending on the solvent employed. The structures and stereochemistry of the dimers are described and a triplet state is proposed as their precursor.
D. Elad, I. Rosenthal and S. Sasson, J. Chem. Soc. C, 1971, 2053 DOI: 10.1039/J39710002053
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