“…A monocyclic aryl nitrene isomerizes to a dehydroazepine intermediate, whereas a polycyclic aryl nitrene preferentially isomerizes to an azirine . The isomeric intermediates, dehydroazepines or azirines, may react with nucleophilic species such as amines, alcohols, thiols, halide ions, or water to give insertion products, 2-substituted 3 H -azepines or 2-substituted anilines, respectively. , The primary product for a triplet aryl nitrene, however, would lead to an aniline generated by sequential hydrogen abstractions from the solvent molecules. The addition products formed in the photolysis of 5-azido-8-methoxypsoralen are from the nitrene intermediate directly.…”