Unusual Reaction of Azoxybenzenes with<i>p</i>-Toluenesulfonic Acid in Acetic Anhydride
作者:Ichiro Shimao、Ken Fujimori、Shigeru Oae
DOI:10.1246/bcsj.55.1538
日期:1982.5
azoxybenzene with p-toluenesulfonic acid in acetic anhydride gave tosylates of 4- and 2-(phenylazo)phenols, and the corresponding acetates as by-product, besides azobenzene. However, a similar reaction of 4,4′-difluoroazoxybenzene gave 2-tosyloxy-4,4′-difluoroazobenzene as rearrangement product, besides 4-fluorophenyl tosylate and 4-fluorophenyl acetate. Meanwhile, the reaction of 4,4′-diacetoxyazoxybenzene
在乙酸酐中用对甲苯磺酸处理偶氮苯得到 4-和 2-(苯基偶氮)苯酚的甲苯磺酸盐,以及作为副产物的相应乙酸盐,除了偶氮苯。然而,4,4'-二氟偶氮苯的类似反应得到2-甲苯磺酰氧基-4,4'-二氟偶氮苯作为重排产物,除了4-氟苯基甲苯磺酸酯和4-氟苯基乙酸酯。同时,4,4'-二乙酰氧基偶氮苯的反应以高产率得到4-乙酰氧基苯基甲苯磺酸酯和氢醌二乙酸酯。这些独特的反应涉及 C-N 键的断裂,并且可能通过涉及形成苯重氮离子作为关键中间体的途径进行。