dissociation-recombination process with significant leakage of the 4-methylphenol and benzoyl cation. The reaction is compared with the Fries/retro-Fries equilibrium which has been induced between phenyl esters and 2- and 4-acyl phenols. Observations are made on the photochemical Fries rearrangement of 4-methylphenyl acetate, which has been suggested to proceed via 4-acetyl-4-methylcyclohexa-2,5-dienone, and of 4-methylphenyl
4-苄基-4-甲基环己-2,5-二烯酮是几种相对稳定的4-酰基环己-2,5-二烯酮之一。为了尝试用酰基溶剂实现二烯酮-
苯酚的重排。在每种情况下,都会发生快速的酰基迁移,通过逆向弗里斯重排产生
苯甲酸4-甲基苯酯,同时对
苯酚进行一些裂解。苯甲酰基可以被另一种
苯酚捕获,其机理可以说是一种离解-
重组过程,其中4-甲基
苯酚和苯
甲酰基阳离子会大量泄漏。将反应与已在苯基酯与2-和4-酰基
酚之间诱导的Fries / retro-Fries平衡进行比较。观察到
乙酸4-甲基苯酯的光
化学弗里斯重排,已建议通过 4-乙酰基-4-甲基环己-2,5-二烯酮和4-甲基苯基
苯甲酸酯。