Chorinated benzenes (1, 4), biphenyls (6, 9), dibenzofurans (10, 15, 17, 18), 2-chlorodibenzo[1,4]dioxine (24) and 1-chloronaphthalene (26) as well as dibenzofuran (12) and naphthalene (27) themselves were transformed into carboxylic acids by galvanostatic electroreduction in the presence of carbon dioxide ("electrocarboxylation"). Dry DMF was used as solvent, zinc or stainless steel as cathode and magnesium as a sacrificial anode in an undivided cell. Hydrogenation of aromatic rings was not observed. However, reductive addition of two molecules of carbon dioxide to form dihydrodicarboxylic acids, e.g. 22 and 29, occurs in the dibenzofuran and naphthalene series.
氯苯(1,4),
联苯(6,9),
二苯并呋喃(10,15,17,18),2-
氯二苯并[1,4]二噁英(24)和
1-氯萘(26)以及
二苯并呋喃(12)和
萘(27)本身在存在
二氧化碳的条件下通过恒电流电还原转化为
羧酸(“电羧化反应”)。干燥
DMF被用作溶剂,
锌或不锈钢作为阴极,
镁作为牺牲阳极在一个不分隔的电池中。芳香环的氢化反应没有观察到。然而,在
二苯并呋喃和
萘系列中发生两分子
二氧化碳还原加成形成二氢二
羧酸,例如22和29。