Description:
<jats:title>Abstract</jats:title>
<jats:p>The dye-sensitized photooxygenation of 2-phenyl-1,3-oxazepine (1) in methylene chloride yields fragment products, 2, 3, 4, and 5. Among them, pyrrolinone (2) and butenolide (3) are assumed to originate from the 1,4-epidioxide (6), and ethylidene malonaldehyde (4) from dioxetane (10) or 1,6-epidioxide (11).</jats:p>