作者:Michael J. Bullivant、Gerald Pattenden
DOI:10.1039/p19760000249
日期:——
or OAc), (6a), and (21) undergo di-π-methane rearrangement to vinylcyclopropanes [(3a and b), (7), and (29), respectively], whereas the side-chain substituted analogues (2b; R = OMe or OAc), (2c; R = OAc), and (6b), under similar conditions, undergo Z–E isomerisation. Sensitisation and quenching experiments with (2a; R = OAc) suggest that (3) is derived from a triplet excited state of (2a). The reactivity
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。