申请人:Hoechst Aktiengesellschaft
公开号:US04540815A1
公开(公告)日:1985-09-10
Process for the preparation of pure 3-acetylaminoanilines of the general formula (1) ##STR1## in which R denotes a hydrogen atom or an alkoxy group with 1-4 carbon atoms, by reduction of 1,3-dinitrobenzene in an alkanol with 1-4 carbon atoms to the 1,3-diaminobenzene or by reaction of 2,4-dinitrochlorobenzene with sodium hydroxide in an alkanol with 1-4 carbon atoms and subsequent reduction to the 2,4-diaminoalkoxybenzene, and in each case subsequent monoacetylation in the alkanol mentioned to give the 1-amino-3-acetylamino-benzene or the 2-amino-4-acetylamino-alkoxy-benzene and isolation of the compound of the above formula (1) obtained in the alkanolic solution, which optionally contains water, which comprises carrying out the isolation by precipitation of the compound of the above formula (1), in the form of the hydrohalide, from the alkanolic solution by means of hydrogen halide or aqueous hydrogen halide acid and subsequent filtration.
制备一般式(1)##STR1##中R表示氢原子或1-4个碳原子的烷氧基的纯3-乙酰氨基苯胺的过程,包括在1-4个碳原子的烷醇中还原1,3-二硝基苯为1,3-二氨基苯,或在1-4个碳原子的烷醇中将2,4-二硝基氯苯与氢氧化钠反应,然后还原为2,4-二氨基烷氧基苯,并在所述烷醇中进行单乙酰化反应,以得到1-氨基-3-乙酰氨基苯或2-氨基-4-乙酰氨基烷氧基苯,并从含有水的可选烷醇溶液中分离得到上述一般式(1)化合物的过程,其中通过使用氢卤酸或水合氢卤酸沉淀上述一般式(1)化合物的氢卤酸盐形式,并随后进行过滤来进行分离。