已经研究了几种取代的2-(丙-2-烯基)环戊-2-烯酮的光化学。2-(丙-2-烯基)环戊-2-烯酮(2a; R = OMe或OAc),(6a)和(21)进行二-π-甲烷重排为乙烯基环丙烷[[3a和b),( 7)和(29)],而侧链取代的类似物(2b; R = OMe或OAc),(2c; R = OAc)和(6b)在相似条件下进行Z – E异构化。用(2a; R = OAc)进行的敏化和淬灭实验表明(3)源自(2a)的三重激发态。在(2a),(6a)和(21)以及(2b),(2c)和(6b)之间的反应性差异是基于在(分子的侧链。
Thermal rearrangements of 2-cyclopropylcycloalk-2-enones
作者:Gerald Pattenden、Derek Whybrow
DOI:10.1039/p19810003147
日期:——
Thermolysis of 2-(2,2-dimethylcyclopropyl)cyclopent-2-enone (2) and 2-cyclopropylcyclohex-2-enone (6) is shown to produce 2-(3-methylbut-2-enylidene)cyclopentanone (10) and 2-propylphenol (14), respectively, via homo[1,5]sigmatropic H-migration and isomerisation. Heating 2-cyclopropylcyclopent-2-enone (8) under a variety of conditions led only to decomposition; no products [e.g.(11)] resulting from