Abstract The present study discusses the behaviour of fluorinated azoxybenzenes in strong acids. 2, 2′, 3, 3′, 5, 5′, 6, 6′-Octafluoro-azoxybenzene I reacted with chlorosulphonic acid giving the Wallach rearrangement product, the chlorosulphonate ester of 4-hydroxy-2, 2′, 3, 3′, 5, 5′, 6, 6′-octafluoroazobenzene. In HF, H 2 SO 4 and HSO 3 F compound I was stable, whereas in SbF 5-HSO 3 F (1: 1) at 20 C, it gave quantitatively the reduction ...
