tetrafluoro-l4-borane, (21,22-dimethyl-14,15-dihydro-9,13:16,20-di(metheno)cyclotetradeca[l]phenanthren-14-yl)dimethylsulfonium salt 在
potassium tert-butylate 作用下,
以
四氢呋喃 为溶剂,
反应 0.75h,
以45%的产率得到anti-8,28-dimethylphenanthro<9,10-l><2,2>metacyclophan-1-ene