本文描述了在温和的反应条件下,分子氧(O 2)对环己烯的电化学偶联环氧化反应。在此,在具有树电极系统的自组装H型电解池中,在相对环境友好的含电解质的丙酮/水介质中,将O 2电还原为过氧化氢(H 2 O 2)的温度为25–30°C,提供约。在最佳电解条件下,H 2 O 2的浓度为44.3 mM 。原位生成的H 2 O 2对环己烯的环氧化在金属配合物催化下同时发生。相对于最佳催化剂5-Cl-7-I-8-喹啉金属锰(III)配合物(Q 3 Mn III(e)),环己烯转化率为19.8%,环氧化选择性为78%。目前的电化学偶合环氧化结果几乎等同于环己烯与由Q 3 Mn III(e)催化的H 2 O 2的环氧化反应。
A highly efficient method of epoxidation of olefins with hydrogen peroxide catalyzed by changeable hexadentate 8-quinolinolato manganese(III) complexes
Novel hexadentate binding 8-quinolinolato manganese(III) complexes were proposed and conveniently synthesized for the epoxidation of olefins with aqueous hydrogenperoxide in water–acetone media with ammonium acetate and acetic acid as additives. The catalytic efficiencies of the suggested catalysts were found to be obviously superior to the traditional tetradentate salen–MnIIICl, due to their special
提出了新颖的结合六齿酸盐的8-喹啉酮基锰(III)配合物,可方便地在乙酸-乙酸铵和乙酸为添加剂的水-丙酮介质中用过氧化氢水溶液对烯烃进行环氧化。发现所建议的催化剂的催化效率明显优于传统的四齿salen-Mn III Cl,因为它们特殊的六齿结合结构可以通过打开一个轴向MnO键很容易地转化为带有悬垂羟基的五齿结合结构。 UV-vis光谱,原位循环伏安法和石英晶体微量天平表征为反应介质提供了支持。