Sulfonation and sulfation in the reactions of the chloro- and dichlorophenols, 3-fluorophenol and (2,3-, 2,4- and 3,4-dichlorophenoxy)acetic acid with concentrated aqueous sulfuric acid and sulfur trioxide
作者:Peter de Wit、Hans Cerfontain
DOI:10.1002/recl.19881070303
日期:——
The chloro- and dichlorophenols have been sulfonated with sulfuric acid and with SO3 in aprotic solvents. In the sulfonations with concentrated aqueous sulfuric acid, the sulfonic acid isomer distribution is determined mainly by the ortho- and para-directing and activating effect of the hydroxy substituent; this is also the determining factor in the aprotic sulfonations using up to 1.0 equiv of SO3
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 methylphenylsulfate (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 phenylmethanesulfonate (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。
WIT, PETER DE;WOLDHUIS, ALEX F.;CERFONTAIN, HANS, REC. TRAV. CHIM. PAYS-BAS, 107,(1988) N2, C. 668-675
作者:WIT, PETER DE、WOLDHUIS, ALEX F.、CERFONTAIN, HANS
DOI:——
日期:——
WIT, PETER DE;CERFONTAIN, HANS, REC. TRAV. CHIM. PAYS-BAS, 107,(1988) N 3, 121-124