Irradiation of alkane-linked DNA hairpins possessing TTT steps with flanking purine bases yields products identified as the cis–syn (2 + 2) dimers formed between the central thymine and its 3′- and 5′-neighbors. Selective formation of the 3′-dimer is attributed to ground state conformational effects and electron transfer quenching by purine bases.
P. P. Neelakandan, Z. Pan, M. Hariharan and F. D. Lewis, Photochem. Photobiol. Sci., 2012, 11, 889 DOI: 10.1039/C2PP25089F
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