Irradiation of pyridazine 1,2-dioxides in dich-PHOTOCHEMICAL reactions of heterocyclic amine N-oxides, loromethane afforded 1,4,6,7-dioxadiazocins as major e.g., pyridine,l pyridazine2a#b$c and pyrimidine N-oxides,Z products, together with the deoxygenated pyridazines. have been widely investigated. Photochemical reactions of "'-dioxides of heteroaromatic compounds such as
Die Belichtung der Di‐N‐oxide (II) ergibt nicht, wie beschrieben, die Dioxadiazocine (I), sondern die Bicyclen (III), die in einem l:5‐Gemisch von Ethanol und Tetrahydrofuran bei Obis 5°C zu den Verbindungen (IV) reduziert werden.
Die Belichtung l‐2%iger Lösungen der Dioxide (I) ergibt in Dichlormethan die Dioxadiazocine (II) als Hauptprodukte, daneben entstehen die Pyridazine (III).
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