Syntheses of Benzilic Acids through Electrochemical Reductive Carboxylation of Benzophenones in the Presence of Carbon Dioxide
作者:Yoshikazu Ikeda、Eiichiro Manda
DOI:10.1246/bcsj.58.1723
日期:1985.6
Reaction conditions for the electrochemical synthesis of benzilic acid (2a) under the atmosphere of carbon dioxide was investigated from the preparative points of view. The highest yield of 2a (86%) was obtained under the following conditions; cathode: mercury, electricity passed: 2.3 F/mol, constant current density: 2.5 mA/cm2, benzophenone (1a) (8.2×10−3mol), electrolyte(KI, 1.7×10−2mol) in DMF (50
从制备的角度研究了在二氧化碳气氛下电化学合成二苯甲酸 (2a) 的反应条件。2a 的最高收率 (86%) 在以下条件下获得;阴极:汞,电流通过:2.3 F/mol,恒流密度:2.5 mA/cm2,二苯甲酮(1a)(8.2×10-3mol),DMF(50ml)中的电解质(KI,1.7×10-2mol)。该方法和条件应用于 12 种苯甲酸 (2b-2m) 的合成,并产生了 10-92% 的酸。产率很大程度上取决于取代基的电子效应,当环取代基为 NO2、OH 或 Br 基团时,未获得苯甲酸。