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NMR ANALYSES OF TRYPTOPHAN‐8‐METHOXYPSORALEN PHOTOREACTION PRODUCTS FORMED IN THE PRESENCE OF OXYGEN

Proton‐made spectroscopy was performed on solutions of l‐tryptophan and 8‐mcthoxypsoralen (8‐MOP) in either D2O or DMSO‐d6 in the presence of oxygen before and after irradiation with 360 nm monochromatic light. Irradiation results in the loss of hydrogen atoms at the 3. 4 and 4′. 5′ positions of 8‐MOP and at the indole C2 position of tryptophan. Changes in the aliphatic regions of the spectra also occur with irradiation. It is postulated that generation of photoreaction products between 8‐MOP and tryptophan involves the 3.4 and 4′.5′ positions of 8‐MOP and the imidazole moiety of tryptophan.