作者:M.R. Diaz-Mondejar、M.A. Miranda
DOI:10.1016/0040-4020(82)80242-1
日期:1982.1
methoxybenzophenone3 upon irradiation, but the yields are low both in hexane and in methanol.p-Methoxyphenylo-acetoxybenzoate1 undergoes photo-Fries rearrangement, affording 2′ - acetoxy - 2 - hydroxy - 5 - methoxybenzophenone4 in good yield. Compound4 is not stable in silica gel: it isomerizes to 2′ - acetoxy - 2 - hydroxy - 5′ - methoxybenzophenone5, that is also the major acetylation product of3 with acetyl
-对甲氧基苯基水杨酸酯2在辐照下得到2,2'-二羟基-5-甲氧基二苯甲酮3,但是在己烷和甲醇中产率均较低。对-甲氧基苯基邻-乙酰氧基苯甲酸酯1经历光-弗里斯重排,以良好的收率得到2'-乙酰氧基-2-羟基--5-甲氧基二苯甲酮4。化合物4在硅胶中不稳定:它异构化为2'-乙酰氧基-2-羟基-5'-甲氧基二苯甲酮5,这也是3与乙酰氯的主要乙酰化产物。从1开始,2-甲氧杂蒽酮7 以57%的总收率获得。