Ethynyldimethylphenylsilane (2) was lithiated with butyllithium and reacted with (perfluorohexyl)ethyl triflate (1) to afford silylated 4-(perfluorohexyl)butyne 3, which was deprotected with potassium fluoride to give 4-(perfluorohexyl)butyne 4. Lithiation of fluoroalkyne 4 with butyllithium followed by the addition of polyfluoroalkyl triflate 1 furnished bis(perfluorohexyl)butyne 5 in a moderate yield. Polyfluoroalkylated alkynes 3, 4 and 5 are perspective building blocks for fluorous chemistry, the sufficient nucleophilic properties of which are preserved by one or two ethylene spacers between the triple bond and perfluoroalkyl group(s).
乙炔二甲基苯基硅烷(2)与丁基锂反应并与(全氟己基)乙基三氟甲基磺酸酯(1)反应,生成硅化的4-(全氟己基)丁炔(3),随后用氟化钾去保护,得到4-(全氟己基)丁炔(4)。将氟代炔(4)与丁基锂锂化后加入多氟代烷基三氟甲基磺酸酯(1),得到双(全氟己基)丁炔(5),收率适中。多氟代烷基化的炔(3)、(4)和(5)是氟化学的有前途的构建单元,其中三键和全氟烷基之间有一个或两个乙烯间隔,保留了足够的亲核性质。