selectivity can be switched to give predominantly the E‐alkene instead by using KHF2/TsOH (see scheme). The utility of the methodology has been illustrated in a short synthesis of a component of the sex pheromone of the Californian red scale beetle.
E-烯丙基
硼酸酯与TBAF⋅3H 2 O经历高度非对映选择性的原脱
硼硼烷反应,生成Z-三取代的烯烃。通过使用KHF 2 / TsOH,可以将选择性切换为主要生成E-烯烃(参见方案)。该方法的实用性已在加利福尼亚红鳞甲虫性信息素成分的简短合成中得到了说明。