Photo-valence isomerization between 2-phenyl-1,3-oxazepine and 3-phenyl-2-oxa-4-azabicyclo[3,2,0]hepta-3,6-diene

Abstract
Irradiation of 2-phenyl-1,3-oxazepine (I) with 300 or 350 nm light afforded 3-phenyl-2-oxa-4-azabicyclo[3,2,0]hepta-3,6-diene (II), whereas irradiation of (II) with 250 nm light caused ring opening to give (I).

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