Aromatic sulphonation. Part 55. Reaction of polyisopropylbenzenes with concentrated aqueous sulphuric acid
作者:Hans Cerfontain、Ankie Koeberg-Telder、Cornelis Ris
DOI:10.1039/p29770000720
日期:——
6-tri-isopropylbenzene-sulphonic acid which is rapidly converted into the 2,4,5-isomer and 3,5-di-isopropylbenzenesulphonic acid. The ratio of formation of these compounds is 0.53 ± 0.05; their eventual ratio in the reaction mixture was, however, 1.0 ± 0.1. 1,2,4,5-Tetraisopropylbenzene with 9 : 1 (v/v) 98.4% H2SO4–CF3CO2H at 25° yielded initially the corresponding tetraisopropylbenzenesulphonic acid, but eventually
已经研究了许多聚异丙基苯在25°下的反应,主要是98.4%H 2 SO 4。对-和对-二异丙基苯进行磺化; 没有观察到副反应。1,2,3-三异丙基苯与ClSO 3 H在0° C的CCl 4中产生80%的2,4,6-三异丙基苯磺酰氯和少量的2,4,5-异构体。1,3,5-三异丙基苯与98.4%H 2 SO 4导致形成2,4,6-三异丙基苯磺酸,该酸迅速转化为2,4,5-异构体和3,5-二异丙基苯磺酸。这些化合物的形成比例为0.53±0.05;但是它们在反应混合物中的最终比例为1.0±0.1。1,2,4,5-四异丙基苯与9:1(v / v)98.4%H 2 SO 4 –CF 3 CO 2 H在25°下产生,最初产生相应的四异丙基苯磺酸,但最终产生2,4,5-三异丙基苯。和3,5-二异丙基苯磺酸的比率为6.0±0.6。提出了形成由1,3,5-三-和1,2,4,5-四异丙基苯获得的各种产物的机理。