Electrolysis of trichloromethylated organic compounds under aerobic conditions catalyzed by the B<sub>12</sub> model complex for ester and amide formation
作者:Hisashi Shimakoshi、Zhongli Luo、Takuya Inaba、Yoshio Hisaeda
DOI:10.1039/c6dt00556j
日期:——
various alcohols such as methanol, n-propanol, and i-propanol. Benzoyl chloride was detected by GC-MS during the electrolysis as an intermediate for the ester formation. When the electrolysis was carried out under anaerobic conditions, partially dechlorinated products, 1,1,2,2-tetrachloro-1,2-diphenylethane and 1,2-dichlorostilibenes (E and Z forms), were obtained instead of an ester. ESR spin-trapping
在-0.9 V vs.的条件下电解三氯苯。在有氧条件下,使用配备了铂网阴极和锌板阳极的不分隔电池,在乙醇中,在B 12模型配合物,高氯酸七甲酯的高氯酸盐存在下,Ag / AgCl以56%的收率和92%的选择性产生了苯甲酸乙酯。当电解在各种醇如甲醇中进行,得到相应的酯,Ñ丙醇,和异丙醇。在电解过程中,通过GC-MS检测到苯甲酰氯作为形成酯的中间体。在厌氧条件下进行电解时,部分脱氯的产物1,1,2,2-四氯-1,2-二苯乙烷和1,2-二氯stilibenes(E和Z形式),而不是酯。使用5,5,-二甲基吡咯啉N-氧化物(DMPO)进行的ESR自旋捕集实验表明,在有氧和厌氧条件下电解过程中,稳定地分别生成了相应的以氧为中心的自由基和以碳为中心的自由基。描述了将好氧电解应用于各种有机卤化物,例如取代的三氯甲烷。此外,据报道,在乙腈中存在胺的情况下,由B 12模型配合物催化的三氯化苯的好氧电解形成了中等收率的酰胺。