The electrooxidation of alcohols in a disperse system with N-oxyl-immobilized polymer particles (PE-co-AA-N-Oxyl), prepared from poly(ethylene-co-acrylic acid) (PE-co-AA-CO2H), as a disperse phase and an aqueous saturated NaHCO3 containing 20 wt % NaBr as a disperse medium was successfully performed in a simple beaker-type undivided cell under constant-current conditions. The electrooxidation of alcohols proceeded in a similar manner by the use of PE-co-AA-CO2H as a disperse phase, though the current efficiency decreased in some extent. Protection of most of the carboxylic acid moieties on the surface of PE-co-AA-CO2H by esterification or amidation resulted in significant decrease of the product yields, suggesting that the carboxylic acid moieties on the surface of PE-co-AA-CO2H would also act as a mediator for the electrooxidation of alcohols. Both the recovered PE-co-AA-N-Oxyl and the aqueous solution were used repeatedly for the electrooxidation of alcohols, thereby offering a formally closed system for the electrooxidation of alcohols.
在采用N-氧基固定化聚合物颗粒(PE-co-
AA-N-Oxyl)作为分散相,以及含有20 wt% NaBr的饱和NaHCO3
水溶液作为分散介质的分散体系中,成功地在一简单的杯型无隔膜电池中在恒电流条件下进行了醇的电氧化。通过使用PE-co-
AA-CO2H作为分散相,醇的电氧化过程与此类似,尽管电流效率在某种程度上有所降低。通过酯化或酰胺化保护PE-co-
AA-CO2H表面上的大多数
羧酸官能团导致产品收率显著降低,表明PE-co-
AA-CO2H表面上的
羧酸官能团也会作为醇电氧化的介体。回收的PE-co-
AA-N-Oxyl和
水溶液均可重复用于醇的电氧化,从而为醇的电氧化提供了一个形式上的封闭系统。