In an attempt to prepare short-bridged hydroxymetacyclophanes 1b-d, the spirocyclohexadienones 2b-d were pyrolyzed by flash vacuum thermolysis (FVT). Instead of 1b-d, variable amounts of 4-(5-hexenyl)phenol (4b), β-hydroxybenzocycloalkenes (5b-d) and 4-(trans-1-alkenyl) phenols (6c-d) were obtained. The formation of these products is explained by invoking cleavage of a spiro bond in 2 under formation
为了制备短桥羟基羟甲基环酮1b-d,通过快速真空热解(FVT)将螺环己二酮2b-d热解。代替1b-d,获得了可变量的4-(5-己烯基)
苯酚(4b),β-羟基苯并环烯烃(5b-d)和4-(反式-1-烯基)
苯酚(6c-d)。这些产物的形成是通过在中间双自由基3的形成下进行螺环键2的断裂来解释的,该中间双自由基3取决于脂族链的长度和温度,有几种途径可以异构化为自旋成对的产物。