t-Butyl, i-propyl and phenyl 2,4,6-cycloheptatriene-1-yl ketone (=1a},=c},=d}, respectively) have been synthesized. At −139°C, rather unexpectedly, the t-butyl ketone =1a} exists in a 1:1 equilibrium with its norcaradiene isomer =2a}.
已经合成了叔丁基,异丙基和苯基2,4,6-
环庚三烯-1-基酮(分别为= 1a},= c},= d})。在-139℃下,出乎意料的是,叔丁基酮= 1a}与其
降冰片烯异构体= 2a}以1:1的平衡存在。