Reactions of<i>ap</i>- and<i>sp</i>-1-(9-Fluorenyl)-2-(1-methylethenyl)naphthalene Rotamers with Bromine Chloride or Iodine Chloride and Unusual Populations of the Corresponding 1-(9-Fluorenyl)-2-[(<i>E</i>)-2-halo-1-methylethenyl]naphthalene Rotamers
作者:Michinori Oki、Takanori Hirose、Kiyoka Maeda、Maki Yanagawa、Yasukazu Kataoka、Hiroharu Kojima、Nobuhiro Morita、Shinji Toyota
DOI:10.1246/bcsj.70.859
日期:1997.4
low nucleophilicity and high proton affinity of the chloride ion. Iodine chloride afforded more addition product for the ap-isomer than the case of bromine chloride, whereas the sp-isomer reacted with iodine chloride to give a better yield of a cyclized compound, (8R*,14cS*)-8-iodomethyl-8-methyl-8,14c-dihydrodibenzo[a,l]aceanthrylene, than that of the cyclized compound from bromine chloride. Such results
进行氯化溴和氯化碘与烯键在 1-(9-芴基)-2-(1-甲基乙烯基)萘旋转异构体中的反应以检查产物分布。在对异构体氯化溴的情况下,除加成产物外还产生一些溴烯烃,而 (8R*,14cS*)-8-溴甲基-8-甲基-8,14c-二氢二苯并[al]相对于溴和 sp-异构体之间的反应的情况,sp-异构体中的乙炔减少。结果归因于氯离子的低亲核性和高质子亲和力。与氯化溴相比,氯化碘为 ap-异构体提供了更多的加成产物,而 sp-异构体与氯化碘反应得到更高产率的环化化合物 (8R*,14cS*)-8-iodomethyl-8 -甲基-8,14c-二氢二苯并[a, l]aceanthrylene,而不是来自氯化溴的环化化合物。这样的结果归因于碘取代基对β-...的更好的稳定作用。