On the photoisomerization of bicyclo[3.2.n]dienones
作者:Harold Hart、Sun-Mao Chen、Makoto Nitta
DOI:10.1016/s0040-4020(01)92380-4
日期:——
Two bicyclo[3.2.n]dienones, which differ from one another only by the presence or absence of an O atom as the “n” bridge, show very different pbotoisomerization behavior. Irradation of hexamethyl-8-oxabicyclo[3.2.1]octadienone 12 gives endo-6-acetylpentamethylbicyclo[3.1.0]hexenone 16, probably via an initial [1,3] sigmatropic rearrangement (Scheme 3). In contrast, hexamethylbicyclo[3.2.0]heptadienone