ring opening and cyclisation, whereas under irradiation it undergoes, degradation to 10-hydroxy-10-phenyl-9-anthrone 7a and isomerizations to the bicyclic acetal 8a and to the benzofuro(3,2-b] benzofuran 9a. These transformations of 4a explain previous results obtained when irradiating 1a under various conditions; their mechanisms are discussed.
在长波长(λ⩾435 nm)照射时,9,10-二苯基
蒽1a的9,10-内过氧化物异构化为4a,10:9,9a-二环氧化合物4a,可以在低温下将其分离。在20–25°c升温时,4a通过开环和环化作用仅生成
苯并环丁烯二醚6a,而在辐射下会降解为10-羟基-10-苯基-9-
蒽酮7a并异构化为双环
缩醛8a和向
苯并呋喃(3,2- b ]
苯并呋喃9A。的这些变换4A说明当照射之前的结果获得的图1A在各种条件下;他们的机制进行了讨论。