Thermolysis of the 2,5-bis(trimethylsiloxy)tricyclo|4.4.0.02,5| decan-7-ones leads to perhydroazulenes by a transannular reaction involving an oxygen to oxygen migration of a silyl group in the intermediate cyclodecadienones. This 3-step transformation of a 2-cyclohexenone into a perhydroazulene is illustrated by the synthesis of the carotane (+)-daucene ().
2,5-双(三甲基甲
硅烷氧基)
三环| 4.4.0.0 2,5 | decan-7-ones通过跨环反应生成过氢azulenes,该跨环反应涉及中间体环癸二烯酮中甲
硅烷基的氧迁移至氧。2-
环己烯酮向全氢氮杂烯的这种三步转化通过
胡萝卜素(+)-
丁二烯()的合成来说明。