The photolysis of 1H-1, 2-diazepine 4, 7-epidioxides (1) with a low pressure mercury lamp resulted in the formation of 5-ethoxy-1, 3, 4-oxadiazoles (3), azoxy compounds (4), and diene compounds (5). A reasonable mechanism for the formation of the products may involve initial isomerization to the 1, 2, 3-oxadiazoles (8), followed by decomposition and isomerization. However, the azepine 2, 5-epidioxide (2) gave only the diene compound (6) in a low yield and did not give any other characterized products.
用低压
汞灯光解 1H-1, 2-二氮杂 4, 7-环氧化合物 (1),形成 5-乙氧基-1, 3, 4-恶二唑 (3)、氧化偶氮化合物 (4)、和二烯化合物(5)。形成产物的合理机制可能涉及初始异构化为
1,2,3-恶二唑 (8),然后进行分解和异构化。然而,吖庚因2, 5-
环氧化物(2)仅以低收率得到二烯化合物(6),并且没有得到任何其他特征产物。