and chemical correlations. Two new sesquiterpene hydrocarbons, petasitene and pethybrene, could be identified. Petasitene is the parent sesquiterpene hydrocarbon to the known norsesquiterpene albene. The absolute configuration of petasitene could be assigned by conversion of natural albene to petasitene by partial synthesis. Pethybrene is a tricyclic sesquiterpene hydrocarbon, which rearranges to the
通过气相色谱、质谱、一维和二维核磁共振技术和
化学相关性研究了 Petasites hybridus (菊科) 根茎的精油。可以确定两种新的
倍半萜烃,petasitene 和 pethybrene。Petasitene 是已知的去甲
倍半萜烯的母体
倍半萜烃。可以通过部分合成将天然杓苯转化为 petasitene 来指定 petasitene 的绝对构型。Pethybrene 是一种
三环倍半萜烃,在酸性条件下重排为结构相关的 α-
异戊二烯。从 Petasites hybridus 的
水蒸馏产物中分离出几种
倍半萜,并通过光谱方法和
化学相关性进行研究