2.1]heptane (1) and 2,3,5,6,7-pentamethylidenebicyclo[2.2.2]-octane (2) are reported. The Diels-Alder additions of the diene moieties of these polyenes can be regioselective, probably because of a possible transannular interaction between the homoconjugated methylidene and s-cis-buta-diene groups.
报道了2,3,5-三亚甲基
双环[2.2.1]庚烷(1)和2,3,5,6,7-五亚甲基双环[2.2.2]-
辛烷(2)的合成。的狄尔斯-阿尔德这些多烯的二烯部分的增加可以是区域选择性,可能是因为homoconjugated亚甲基之间可能存在的跨环相互作用的小号-顺-
丁二烯基。