Abstract
For the molecular structure of the photolytic product of acridine-N-oxide in dilute solutions of alcohols, two possibilities are discussed: structure I a 9-C-substituted acridan and structure II a substituted dihydro-oxazepine. By means of uv- and NMR-spectroscopic investigations as well as Pariser, Parr, Pople calculations it is shown that structure II is valid. In ethanol solutions this is 11-ethoxy-5,11-dihydrodibenz[ b, e]-1,4-oxazepine, in which the planes of the two rings form an angle of 60°.
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