Abstract
Abstract— The in vitro photooxidation of 8‐methoxypsoralen (8‐MOP) with singlet oxygen is studied. Irradiation of 8‐MOP(295–400 or320–400 nm) in the presence of oxygen for 72 h results in the formation of a product (1.4%) which is identified as 6‐formyl‐7‐hydroxy‐8‐methoxycoumarin by aid of IR, NMR, MS and co‐chromatography with an authentic sample. A study of this reaction in the presence of l,4‐diazobicyclo(2,2,2)octane, a singlet oxygen scavenger, indicates the involvement of 1O2 in the formation of this compound. In addition to this, formation of a novel dimer of 8‐MOP is reported.
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