On the intermediacy of phenyl hydrogen sulfates in the sulfonation of phenols. Sulfonation of phenol, anisole, methyl phenyl sulfate, the 2-halogenophenols, a series of phenyl methanesulfonates together with 2,6-dimethylaniline and its N-methylsulfonyl de
作者:Peter de Wit、Alex F. Woldhuis、Hans Cerfontain
DOI:10.1002/recl.19881071204
日期:——
The sulfonation of methyl phenyl sulfate (4) with concentrated aqueous sulfuric acid at 25°C yields the 4-sulfonic acid. This initial product then decomposes to give phenol-4-sulfonic acid, which is subsequently sulfonated to phenol-2,4-disulfonic acid. From the first-order-rate coefficients obtained for sulfonation of phenyl methanesulfonate (3) and (4) in 93.2% H2SO4, for which acid concentration
在25℃下用浓硫酸水溶液磺化甲基苯基硫酸酯(4),得到4-磺酸。然后该初始产物分解得到苯酚-4-磺酸,随后将其磺化为苯酚-2,4-二磺酸。从在93.2%H 2 SO 4中将甲磺酸苯基酯(3)和(4)磺化所获得的一级系数,对于磺酸浓度为H 2 S 2 O 7的酸浓度,其σp +值OSO 2 Me和OSO 2已确定OMe取代基分别为0.40和0.46。2-氯苯基(10)和2-甲基苯基甲磺酸盐(14)在2.0 °C下在硝基甲烷中用2.0当量的SO 3磺化产生4-磺酸作为排他的产物,而2-甲氧基苯基甲烷磺酸盐(13),在相同条件下,仅形成5-磺酸。