Intermediates and products formed during the electrochemical reduction of diphenyl disulfide (1) add to chlorotrifluoroethene (3) under the formation of 2-chloro-1,1,2-trifluoroethyl phenyl sulfide (5) and the E/Z isomers of 2-chloro-1,2-difluoroethenyl phenyl sulfide (6). The analogous reaction with 1,2-dichlorodifluoroethene (4) led to a mixture of E/Z isomers of 6. Electrochemically reduced diphenyl diselenide (2) reacted with 3 giving rise to 2-chloro-1,1,2-trifluoroethyl phenyl selenide (7) whereas the reaction with 4 does not proceed. Addition of disulfide 1 to 4 gives evidence of the participation of the radical PhS.. With diselenide 2, an analogous radical addition reaction was not observed. This is consistent with other experiments suggesting different mechanisms of reductive cleavage of the S-S and Se-Se bonds and the absence of radicals PhSe. in the latter.
二
苯基二硫化物(
1)在电
化学还原过程中生成中间体和产物,加入
氯三氟乙烯(
3),生成2-
氯-1,1,2-三
氟乙基苯硫醚(
5)和2-
氯-
1,2-二氟乙烯基苯
硫醚的
E/Z异构体(
6)。用1,2-二
氯二
氟乙烯(
4)进行类似反应会产生
6的
E/Z异构体混合物。电
化学还原的二苯基二
硒化物(
2)与
3反应产生2-
氯-1,1,2-三
氟乙基苯硒醚(
7),而与
4的反应不会进行。将二
硫化物1加入
4中,证明了自由基PhS
.的参与。使用二
硒化物
2进行类似的自由基加成反应没有观察到。这与其他实验表明还原S-S和Se-Se键的机制不同,后者中不存在自由基PhSe
.。