2,4-Diphenylisoxazol-5(2H)-one (2) has been photolysed
in the presence of alcohols, amines and in inert solvents, and the products
are shown to arise by two competitive singlet state photolytic processes. The
minor pathway involves loss of carbon dioxide to give an imino carbene which
is captured by nucleophiles: the major pathway involves isomerization to a
ketene which is rapidly decarbonylated, and the resultant carbene captured by
solvent. The presence of acetone or other triplet sensitizers induces a third
competitive pathway involving triplet states.
2,4-二苯基
异噁唑-5(2H)-酮 (2) 在
醇类、
胺类和惰性溶剂中被光解。
在醇、胺和惰性溶剂中进行了光解,结果表明,产物是通过两个竞争性单线态光解过程产生的。
显示是通过两个竞争性单色态光解过程产生的。其
次要途径包括
二氧化碳的损失,生成一个亚
氨基碳烯,该碳烯被亲核物捕获。
被亲核物捕获:主要途径是异构化为烯酮,并迅速脱碳。
迅速脱羰基,生成的碳烯被溶剂捕获。
溶剂。
丙酮或其他三重态敏化剂的存在会诱发第三种
竞争途径。