Photochemistry of Non-enolizable β-Diketones Containing Cyclopropane Ring in Conjugation
作者:Taiiti Okada、Koiti Kamogawa、Mituyosi Kawanisi、Hitosi Nozaki
DOI:10.1246/bcsj.43.2908
日期:1970.9
Irradiation of bicyclo[3.1.0]hexane-2,4-diones affords isomeric enol lactones retaining the cyclopropane ring. In contrast, photoreaction of 6,6-dimethylspiro[2.5]octane-4,8-dione in ethanol results in the formation of an isomeric benzofuran derivative and dimedone-acetaldehyde condensation product. Cleavage of the cyclopropane ring is characteristic of the behavior of the latter β-diketone.
双环[3.1.0]己烷-2,4-二酮的辐照提供保留环丙烷环的异构烯醇内酯。相比之下,6,6-二甲基螺[2.5] 辛烷-4,8-二酮在乙醇中的光反应导致形成异构苯并呋喃衍生物和二甲酮-乙醛缩合产物。环丙烷环的裂解是后者β-二酮行为的特征。