Specifically (? ? ?*)-Induced Cyclohexenone Reactions 4a-(Z-1-Propenyl)-bicyclo[4.4.0]dec-1 (8a)-en-2-one and 4a-Z-1-Propenyl-bicyclo[4.4.0]deca-1(8a), 7-dien-2-one
作者:Fr�d�ric Nobs、Ulrich Burger、Kurt Schaffner
DOI:10.1002/hlca.19770600517
日期:1977.7.13
4a-(Z-1-Propenyl)-bicyclo[4.4.0]dec-1(8a)-en-2-one (6) and 4a-(Z-1-propenyl)-bicyclo[4.4.0]deca-1(8a), 7-dien-2-one (17) undergo an intramolecular hydrogen transfer from the methyl group of the propenyl substitutent to the α-carbon atom of the enone group, and cyclization to the [4.4.3]propellane derivatives 9 and 30, respectively, when excited in the π π* wavelength region. The quantum yield for (Z)-6
4a-(Z -1-丙烯基)-双环[4.4.0] dec-1(8a)-en-2-one(6)和4a-(Z -1-丙烯基)-双环[4.4.0] deca-在图1(8a)中,7-二烯-2-酮(17)经历分子内氢从丙烯基取代基的甲基转移至烯酮基团的α-碳原子,并环化成[4.4.3]丙炔衍生物当在ππ*波长范围内激发时,分别如图9和30所示。在最佳条件下(Z)-6 9的量子产率在254 nm为0.29,这些反应特别从S 2(π,π*)态发生,与S 2 T竞争衰变。6的三重态反应是E - Z双键异构化,双键转移至(E,Z)-8和重排至(E)-10。通常,进一步的研究涉及反应类型6 9和烯酮S 2反应性范围内的一些结构限制。