orientation of the photochemical reactions of two hexatrienes. A pronounced wavelength effect is observed for Z-2,6-dimethyl-1,3,5-heptatriene; photocycloaddition leads to a bicyclo[3.1.0]hexene and [1,5] sigmatropic hydrogen migration occurs from an s-cis-s-trans conformation preferentially excited by longer wavelength light, whereas the Z-E interconversion is predominantly observed as a result of
示出了基态构象异构体组成在两种己
三烯的光
化学反应的取向中起决定性作用。对于Z -2,6-二甲基-1,3,5-庚
三烯,观察到明显的波长效应。光环加成导致双环[3.1.0]己烯和[1,5]σ氢迁移是由较长波长的光优先激发的s-顺式-s-反式构型引起的,而ZE的相互转化主要是激发的结果的s反式-S-反式由较短波长的光的构象。