作者:T. Yamazaki、T. Takizawa
DOI:10.1016/0040-4020(72)88076-1
日期:1972.1
The acid catalyzed reaction of several 1,2-di-substituted cyclopenten-3,4,5-triones with benzene is examined. It is found that the substituents on the cyclopentene ring affect the reaction pathway and the structure of the products. When the both substituents are C6H5 or CH3O, they react only at their central CO group to give 1,2-di-substituted-4,4-diphenylcyclopenten-3,5-diones. When the substituents
研究了几种1,2-二取代的环戊烯-3,4,5-三酮与苯的酸催化反应。发现环戊烯环上的取代基影响反应途径和产物的结构。当两个取代基均为C 6 H 5或CH 3 O时,它们仅在它们的中心CO基团上反应,得到1,2-二取代的4,4-二苯基环戊烯-3,5-二酮。当取代基为OH(巴豆酸)时,与三摩尔当量的苯缩合,得到1,4,-三苯基-2-羟基环戊烯-3,5-二酮。在该反应中,2-羟基-1-苯基环戊烯-3,4,5-三酮和1,4-二苯基-烯丙基阳离子16的中间体被提议。当取代基为哌啶基时,该化合物不与苯缩合,而是分子内重排以得到1,3-二哌啶基环戊烯-2,4,5-三酮。