Photochemische Reaktionen. 8. Mitteilung. Lichtkatalysierte Cyclodehydrierung von 1,2‐Diaryläthylenen und Azobenzol

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Abstract
The formation of phenanthrene from stilbene upon irradiation in concentrations suitable for synthetic purposes has been investigated under various reaction conditions. It has been demonstrated that oxygen acts as a very efficient hydrogen acceptor, although the reaction can as well be achieved in an inert atmosphere, presumably by intermolecular oxidation‐reduction processes. This photochemical method has been applied to the synthesis of substituted phenanthrenes, chrysene and 2,2′‐azobiphenyl (3,4‐benzocinnoline, «phenazone»).