Perfluoroalkylation of Olefins by Electrooxidation of Perfluoroalkanoic Acids: Relations between Product-Selectivity and Current Density and Structures of Olefins
作者:Kenji Uneyama、Shunsuke Watanabe、Yukio Tokunaga、Kouichi Kitagawa、Yasuhiro Sato
DOI:10.1246/bcsj.65.1976
日期:1992.7
Electrooxidation of perfluoroalkanoic acids RfCO2H (Rf = CF3, C3F7, C7F15 together with CHF2, CH2F) in the presence of electron-deficient olefins (methyl acrylate, methyl methacrylate, acrylamide, and acrylonitrile) provided perfluoroalkylated products. The electrolysis was conducted in MeCN–H2O (7 : 1) using platinum electrodes in an undivided cell. Dimerization of methyl acrylate accompanying perfluoroalkylation
在缺电子烯烃(丙烯酸甲酯、甲基丙烯酸甲酯、丙烯酰胺和丙烯腈)存在下,全氟链烷酸 RfCO2H(Rf = CF3、C3F7、C7F15 以及 CHF2、CH2F)的电氧化得到全氟烷基化产物。电解是在 MeCN-H2O (7:1) 中使用铂电极在未分隔的电池中进行的。伴随全氟烷基化的丙烯酸甲酯二聚反应在 20 mA cm-2 电流密度下以 40-50% 的产率发生。在高电流密度(100-200 mA cm-2)下,丙烯酰胺中碳-碳双键的 1,2-加成占主导地位。另一方面,三氟甲基和乙酰氨基的1,2-加成以及三氟甲基和羟基的1,2-加成发生在甲基丙烯酸甲酯的低电流密度(<5 mA cm-2)电解中。