申请人:Bayer Aktiengesellschaft
公开号:US05574188A1
公开(公告)日:1996-11-12
4,6-diaminoresorcinol can be prepared in a plurality of steps in such a way that a) 1,3-dichlorobenzene is nitrated with a mixed acid of HNO.sub.3, H.sub.2 SO.sub.4 and SO.sub.3 at 0 to 40.degree. C. in anhydrous H.sub.2 SO.sub.4, b) the resulting 1,3-dichloro-4,6/2,4-dinitrobenzene isomeric mixture is first reacted with benzyl alcohol in the presence of a strong base at -15.degree. C. to +15.degree. C. and then at 20.degree. to 40.degree. C. to give the dibenzyloxy compound and c) the 1,3-dibenzyloxy-4,6-dinitrobenzene isomer arising in pure form in b) is converted to the 4,6-diaminoresorcinol by catalytic hydrogenation.
4,6-二氨基间苯二酚可以通过多个步骤制备,具体步骤如下:a)在无水H2SO4中,使用HNO3、H2SO4和SO3混合酸对1,3-二氯苯进行硝化,反应温度为0至40℃;b)将得到的1,3-二氯-4,6/2,4-二硝基苯异构体混合物在强碱存在下先在-15℃至+15℃反应,然后在20℃至40℃反应,得到二苄氧基化合物;c)在b)中纯形式出现的1,3-二苄氧基-4,6-二硝基苯异构体通过催化氢化反应转化为4,6-二氨基间苯二酚。