ArCH(OH)CX2CF3 whose hydroxyl group was substituted by fluorine. Dehydrohalogenation of the resultant ArCHFCX2CF3 (X = Cl or F) with DBU or NaNH2/t-BuOH (cat) gave with excellent selectivity the title (E)-propenes.
芳烃甲醛 ArCHO 与类碳化试剂 CF3CX2Mtl(X = Cl,Mtl = ZnCl;X = F,Mtl = Li)反应,得到加合物 ArCH(OH)CX2CF3,其羟基被
氟取代。用
DBU 或 NaNH2/t-BuOH (cat) 对所得 ArCHFCX2CF3 (X = Cl 或 F) 进行脱卤化氢反应,以极好的选择性得到标题 (E)-
丙烯。