Fluoroaromatic derivatives. CI. Transformations of polyfluoroazoxybenzenes in strong acids. Wallach rearrangement of polyfluoroazoxybenzenes
作者:G.G. Furin、O.I. Andreevskaya、A.I. Rezvukhin、G.G. Yakobson
DOI:10.1016/s0022-1139(00)85190-8
日期:1985.5
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, H2SO4 and HSO3F compound I was stable, whereas in SbF5-HSO3F (1:1) at 20 °C, it gave quantitatively the
本研究讨论了氟化a氧基苯在强酸中的行为。2,2',3,3',5,5',6,6'-八氟-甲氧基苯I与氯磺酸反应生成Wallach重排产物,即4-羟基-2,2',3,3的氯磺酸酯',5,5',6,6'-八氟偶氮苯。在HF中,H 2 SO 4和HSO 3 F化合物I是稳定的,而在20°C下的SbF 5 -HSO 3 F(1:1)中,定量给出了还原产物2.2,3.3,5.5 ',6,6'-八氟偶氮苯。使用1 H,13 C,15 N和191 H NMR,我们研究了用强酸处理从氟化a氧基苯产生的阳离子型物质。这些物质在Wallach重排和偶氮苯形成中的作用已得到检验。在HSO 3 Cl中,发生CN键的断裂,在十氟az氧基苯的情况下,导致五氟氯苯和五氟苯基重氮阳离子。建议该反应的途径。