in terms of a novel photorearrangement resulting in transannular bond formation. The structure of this photoproduct was elucidated by a combination of chemical and spectroscopic methods. Two related compounds, diterpene B and D, and their acetate derivatives when photolysed underwent E→Z isomerisation of the conjugated double bond and epimerization about one centre of the cyclopropyl moiety.
辐照大环二萜苯并二氮杂
苯酚导致了单一的光异构体(2),根据新的光重排形式,该光异构体的形成得以合理化,从而导致了跨环键的形成。通过
化学和光谱学方法的结合阐明了这种光产物的结构。当光解时,两个相关的化合物二萜B和D及其
乙酸酯衍
生物经历了共轭双键的E→Z异构化和围绕环丙基部分一个中心的差向异构化。