Sulfonation of 1- and 2-naphthol and their methanesulfonate esters with sulfur trioxide. The influence of initial sulfation on the sulfo-product composition
作者:Harold R. W. Ansink、Erwin Zelvelder、Hans Cerfontain
DOI:10.1002/recl.19931120302
日期:——
The sulfonation of 1- and 2-naphthol with sulfur trioxide in C2H3NO2 has been studied by using 1H NMR. 1-Naphthol (1) yields, upon reaction with 1.0 mol-equiv of SO3, a mixture of 2- and 4-sulfonic acids (2- and 4-S); upon increasing the reaction temperature, the relative amount of 2-S increases. Upon reaction with 4.0 mol-equiv of SO3, the initially observed products are the hydrogen sulfate 1-O,2
使用1 H NMR研究了1-萘酚和2-萘酚在C 2 H 3 NO 2中被三氧化硫磺化。1-萘酚(1)与1.0摩尔当量的SO 3反应,得到2-和4-磺酸(2-和4-S)的混合物。随着反应温度的升高,2-S的相对量增加。与4.0摩尔当量的SO 3反应后,最初观察到的产物是硫酸氢盐1 - O,2,4-S 3和一些相应的磺酸酐。在延长反应时间后,大约1 - O -4,7-S 3, 形成了。