Abstract
The efficiency of the radiation-induced cleavage of the four stereoisomers of 1,3-dimethyluracil cyclobutane-type dimers is dependent on their stereochemistry. In slightly acid solutions for each electron donor, e/sub aq//sup -/ or CO/sub 2//sup -/ two monomers are formed. In alkaline solutions, the cleavage of cis,syn and cis,anti dimers occurs via a chain mechanism. In pulse radiolysis the dimers behave similarly to the monomer.
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