PROCESS FOR PREPARING SUBSTITUTED 4,4'-DIAMINOSTILBENE-2,2'-DISULPHONIC ACID SALTS

摘要

During the preparation of substituted 4,4'-diaminostilbene-2,2'-disulphonic acid salts the speed of the reaction can be considerably increased by reacting the tetrachlorine derivative (III) with the aniline (IV) in the presence of the amine (VI) as acid absorber.