Fluorinated building blocks, 2-(perfluorohexyl)ethyl triflate (11 a) and 2-(perfluorooctyl)ethyl triflate (11 b) were prepared from the corresponding fluoroalkanols and triflic anhydride. Fluorinated triflates 11 were employed for the preparation of bis(polyfluoroalkylated) cyclopentadienes 9, which are potential ligands for homogeneous catalysts used in fluorous biphase systems. Fluorotriflates 11 are also excellent substrates for the preparation of various polyfluorinated compounds, e.g. nitriles or azides, by nucleophilic substitution.
Bis[2-(perfluoroalkyl)ethyl]cyclopentadienes were synthesized from lithium [2-(perfluoroalkyl)ethyl]cyclopentadienides and 2-(perfluoroalkyl)ethyl triflates as mixtures of four regioisomers, structure of which was determined by 1H and 13C NMR spectroscopy. 2-(Perfluoroalkyl)ethyl triflates are useful fluorinated building blocks that can be employed in the synthesis of functionalised polyfluorinated
由[2-(全氟烷基)乙基]环戊二烯酸锂和2-(全氟烷基)乙基三氟甲磺酸酯作为四种区域异构体的混合物合成双[2-(全氟烷基)乙基]环戊二烯,其结构由1 H和13 C NMR光谱确定。2-(全氟烷基)乙基三氟甲磺酸酯是有用的氟化结构单元,可用于合成官能化的多氟化物质。