acetates have been irradiated by UV light. The reactions observed are: (1) cleavage of the O-acyl bond, leading to phenols, (2) photo-Fries rearrangements, leading to toluene derivatives. Methoxy substituents at the o- and/or p-positions were found to be displaced by the acyl moiety. The decarboxylation reaction is considerably enhanced by substitution at the o- and/or m-positions. In i-propanol and
许多取代的
乙酸苯酯已被紫外线照射。观察到的反应是:(1)O-酰基键的断裂,导致
苯酚,(2)光-Fries重排,导致
甲苯衍
生物。发现在o-和/或p-位的甲氧基取代基被酰基部分置换。通过在o-和/或m-位置上的取代,脱羧反应大大增强。在
异丙醇和
环己烷中,未观察到(或几乎没有)脱羧。然而,在醚中,脱羧作用明显。所有这些反应都是从相同的激发态开始的,即第一个激发单重态。