反应详情

Furthermore, 4-nitrotoluene-2-sulphonic acid can be used for the preparation of 4,4'-dinitrostilbene-2,2'-disulphonic acid, in which, for example, an approximately 30 to 50% strength aqueous solution of 4-nitrotoluene-2-sulphonic acid is reacted with oxidizing agents, for example with atmospheric oxygen. 4,4'-Dinitrostilbene-2,2'-disulphonic acid can be further processed by reduction to give 4,4'-diaminostilbene-2,2'-disulphonic acid (see Ber. 30, 3,100), and is an important intermediate product for the preparation of optical brighteners (A. Dorlars, C.-W. Schellhammer and J. Schroeder, Angew. Chem. 87, 693 (1975)).