Solution photodimerization of 1,3-dimethyluracil

Abstract
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.

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