申请人:Bayer Aktiengesellschaft
公开号:US04426538A1
公开(公告)日:1984-01-17
The invention relates to a process for the preparation of optionally p-chlorine-substituted 2,6-diaminotoluene, which is characterized in that 3,4-dichlorotoluene is dinitrated in the presence of an inert, water-immiscible, organic solvent and/or diluent at temperatures of -10.degree. to +100.degree. C. and is subsequently reduced, optionally after intermediate isolation of the dinitro compound, in the presence of an inert organic solvent and/or diluent and/or of water, with partial or complete splitting-off of the chlorine atoms, to give the diamino compound. 2,6-Diaminotoluenes are valuable intermediates for the preparation of diisocyanates and polyurethanes; the 2,6-diaminotoluene is furthermore used for the preparation of dyestuffs and antioxidants.
本发明涉及一种制备可选取代p-氯的2,6-二氨基甲苯的方法,其特征在于在惰性、不溶于水的有机溶剂和/或稀释剂的存在下,以-10℃至+100℃的温度下使3,4-二氯甲苯二硝化,然后在惰性有机溶剂和/或稀释剂和/或水的存在下,部分或完全脱离氯原子的情况下还原,以得到二氨基化合物。2,6-二氨基甲苯是制备二异氰酸酯和聚氨酯的有价值的中间体;此外,2,6-二氨基甲苯还用于染料和抗氧化剂的制备。