Specifically (? ? ?*)-Induced Cyclohexenone Reactions 6-Benzylbicyclo [4.4.0]dec-1-en-3-ones
作者:Raul Mariaca、Kurt Schaffner
DOI:10.1002/hlca.19790620118
日期:1979.1.24
6-Benzylbicyclo [4.4.0]dec-1-en-3-one (9) and the 2-methyl homologue (10) underwent a (γ α )-1, 3-benzyl shift to the β,γ-unsaturated ketones 21 and 22, respectively, when excited in the π π* absorption band. The quantum yield was ca. 0.1 at 254 nm for the formation of both products in alkane solvents. These reactions occur specifically from the S2(π, π*) state in competition with its decay to the
对6-苄基双环[4.4.0] dec-1-en-3-one(9)和2-甲基同系物(10)进行(γα)-1,3-苄基转移至β,γ-不饱和酮当在ππ*吸收带中激发时,分别如图21和22所示。量子产率为约。254 nm时为0.1,可在烷烃溶剂中形成两种产物。这些反应特别是从S 2(π,π*)状态发生,与其衰变竞争到S 1(n,π*)和T状态。的三重态反应9,通过发起Ñ π*照射和由敏化,是一个双键移位到20,而在这些条件下从10没有观察到可识别的产物。直接和丙酮敏化照射21和22导致了恶二-π-甲烷重排到的混合物顺式-和反- 30和顺-和反- 31分别。