Sulfonation of a series of naphthalenes containing two different oxy substituents
作者:Harold R. W. Ansink、Erwin Zelvelder、Hans Cerfontain
DOI:10.1002/recl.19931120303
日期:——
The reactions of a series of α,α- and β,β-disubstituted naphthalenes containing two different substituents OR1 (R1 = H, SO2CH3) and OR2 (R2 = CH3, SO2CH3) with sulfur trioxide in CD3NO2 has been studied. The electronic directing effect of the hydroxy group was found to be dominant over that of the methoxy group, which in turn dominates that of the mesyloxy group. Upon reaction with an excess of sulfur
一系列含有两个不同取代基OR 1(R 1 = H,SO 2 CH 3)和OR 2(R 2 = CH 3,SO 2 CH 3)的α,α-和β,β-双取代萘与以下物质的反应已经研究了CD 3 NO 2中的三氧化硫。发现羟基的电子导向作用比甲氧基的电子导向作用占主导地位,而甲氧基则反过来占甲氧基的电子导向作用占主导地位。与过量的三氧化硫反应时,羟基至少部分被硫酸化。对于β-羟基-β-甲氧基萘3a-5a特别是对于3-甲甲氧基-2-萘酚(3c),硫酸氢盐的形成强烈影响产物混合物的组成。因此,当与1.0当量的SO 3反应时,7-甲氧基-2-萘酚(5a)产生其1-磺酸(1-S),而当与2.0当量反应时,主要形成8-S。由于最初形成硫酸氢盐。此外,观察到由于位阻引起的磺酸异构化。当使用≥2.0当量的SO 3时,观察到二磺酸和三磺酸的形成,以及8,1-萘磺酸内酯和环状萘-1-磺酸-2-磺酸酐的磺基衍生物。