1,6-Diketone, available in eight steps from homocamphorquinone, was converted into 1,5,5,11,11-pentamethyltricyclo[6.2.1.02,6]undecan-7-one by treatment with potassium t-butoxide and then lithium dimethylcuprate, while α,α-dimethyl-γ-valerolactone, prepared in five steps from homocamphor, was converted into 1,5,5,11,11-pentamethyltricyclo[6.2.1.02,6]undec-2-en-4-one by treatment with diphosphorus 
                                    通过用
叔丁醇钾和二甲基
铜酸
锂处理,1,6-二酮可从高
樟脑醌八步获得,转化为 1,5,5,11,11-五甲基
三环[6.2.1.02,6]undecan-7-one , 而 α,α-二甲基-
γ-戊内酯, 由同
樟脑分五步制备, 被转化为 1,5,5,11,11-五甲基
三环 [6.2.1.02,6]undec-2-en-4-one用五氧化二
磷-
甲磺酸处理。