exclusively to anti-tricyclo[4.2.1.12,5]decane (2) at a higher rate than the latter rearranges to 2-exo,3-exo-trimethylene-8,9,10-trinorbornane (4). However, at temperature above 0°, the anti-isomer 2 isomerizes to 4 faster than 1 to 2 and 4. As a consequence, hydride abstraction occurs at C(3) (carbocation a, which rearranges to carbocation b (anti-skeleton)) in the syn-isomer 1, and more readily at C(9)
在低于0°C的温度下,在CS 2中存在AlBr 3时,顺式-
三环[4.2.1.1 2,5 ]
癸烷(1)仅在温度为0时异构化为抗-
三环[4.2.1.1 2,5 ]
癸烷(2)。比后者高的速率重排为2- exo,3- exo -trimethyl-8,9,10-trinorbornane(4)。然而,在温度高于0°时,抗-异构体2分异构化为4快于1至2和4。其结果是,
氢化物提取发生在C(3)(
碳阳离子一个,其中重排为
碳阳离子b(抗在-skeleton))顺式异构体1,并且更容易在C(9)(
碳阳离子Ç)比在C( 3)在反异构体2中(
碳化b)。