A series of p-benzoquinones having an ester functional group in the α position of alkyl side chains was prepared. Irradiation of these quinones, except for methyl 3-methyl-2-(4-methyl-3,6-dioxo-1,4-cyclohexadienyl)-butyrate (3e), rapidly gave methyl 3-substituted 2,3-dihydro-5-hydroxybenzofuran-2-carboxylate in fairly good yields, and it was found that rearrangement of the side chain occurred concomitantly
制备了一系列在烷基侧链的α位具有酯官能团的
对苯醌。这些醌的辐照,除了甲基 3-甲基-2-(4-甲基-3,6-二氧代-
1,4-环己二烯基)-
丁酸 (3e) 外,迅速得到甲基 3-取代的 2,3-二氢-5 -羟基
苯并呋喃-2-羧酸酯的产率相当好,并且发现侧链的重排伴随发生。醌 3e 的光解得到 2-(2,5-二羟基-4-甲基苯基)-
3-甲基-3-丁烯酸甲酯作为主要产物。假定中间体可以解释孤立的光产物。