Abstract

The photosensitized solution dimerization of thymidine using acetone as a photosensitizer was studied and compared with ultraviolet light induced dimerization of thymidine in frozen aqueous solution. In the photosensitized dimerization the trans-anti thymidine dimer isomer was formed as the major component of the dimer mixture (55 %), whereas in the frozen solution the dimers with cis configuration predominated (86 % of total dimer mixture). In addition to the four thymidine dimer isomers formed in irradiated frozen solution a 5th isomer was observed in the photosensitized solution. This isomer appears to have the trans-syn configuration.

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