Photochemical reactivity of 3-ethoxycarbonylfurocoumarin is studied. Upon irradiation, 3-ethoxycarbonylfurocoumarin forms a cyclobutane with a variety of alkenes at the 3,4-double bond in solution, whereas a similar cyclobutane is formed at the 4′,5′-double bond in DNA. The different site-selectivity in solution from DNA is explained by assuming the involvement of the triplet excited state.
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RATINER et al. (1989) studied this question.
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