Photochemical Reactions 151st Communication. Photo-oxygenation of (E)- and (Z)-7-Methyl-?-ionone
作者:Takehiko Nishio、Peter Mathies、Kurt Job、Bruno Frei、Oskar Jeger
DOI:10.1002/hlca.19890720510
日期:1989.8.9
Photo-oxygenation of (E)-7-methyl-β-ionone ((E)−1) and (E)-8-methyl-β-ionone ((E)−2) gave rise to the formation of the hydroperoxy-enones (E)−10 and (E)−15, respectively, which, in part, underwent intramolecular epoxidation to the hydroxy-epoxy-ketones 11 and 16, respectively, The product distribution of the photo-oxidation of (Z)−1 shows a marked influence of the skewed ground-state conformation of
(E)-7-甲基-β-紫罗兰酮((E)-1)和(E)-8-甲基-β-紫罗兰酮((E)-2)的光氧合导致形成氢过氧-分别进行部分分子内环氧化为羟基环氧酮11和16的烯酮(E)−10和(E)−15,(Z)−1的光氧化产物分布显示了二烯酮生色团的偏基态构象的显着影响。因此,单重态氧(1 O 2)被添加到二烯酮生色团的C(γ)中,导致螺环过氧半缩醛12和内过氧化物13。此外,三环过氧化物14形成为一个新类型的产品通过主加1 Ò 2的二烯酮的发色团,以C(γ)。的结构14是由半缩醛的X射线晶体结构分析,建立22。