Photochemical Reactions. 149th Communication. Photochemistry of 7,8-dihydro-4-hydroxy-?-ionone and derivatives
作者:Alfons Pascual、Norbert Bischofberger、Bruno Frei、Oskar Jeger
DOI:10.1002/hlca.19880710211
日期:1988.3.16
The photolysis of 7,8-dihydro-4-hydroxy-β-ionone (6) was investigated together with its acetate and isopropyl ether 7 and 8, respectively. Irradiation (λ > 245 nm) of 6 in MeCN or i-PrOH at temperatures between 25° and −65° leads to the tricyclic ethers 9, 10 and 13A + B, and to the spirocyclic ethers 11 and 12, which are all known types of photoproducts, previously obtained on photolysis of 7,8-dihydro-β-ionone
研究了7,8-二氢-4-羟基-β-紫罗兰酮(6)的光解反应,分别对其乙酸盐和异丙醚7和8进行了研究。照射(λ> 245纳米)的6在MeCN或I-PrOH中在温度为25°和-65°通向三环醚9,10和13A +乙,以及螺环醚11和12,这是所有已知的类型的光产物,以前是通过7,8-二氢-β-紫罗兰酮(1)的光解获得的。在乙酸盐7和异丙醚8的照射下获得相同类型的产品。另一方面,在-35°至-65°之间的温度下在MeCN或i-PrOH中辐射羟基化合物6导致新的三环叔醇14和15为主要产物。它们的形成涉及到碳阳离子的分子内俘获由相邻的OH基团,从而,支承先前提出的变换机构1 5,对于结构证明,三环醇14和pheny1氨基甲酸酯42,衍生自9,进行X射线分析。