申请人:Bayer Aktiengesellschaft
公开号:US04540817A1
公开(公告)日:1985-09-10
A process for the preparation of 5-amino-2,4-dimethylacetanilide by reduction of 5-nitro-2,4-dimethylacetanilide with hydrogen is disclosed characterized in that a crude mixture containing 5-nitro-2,4-dimethylacetanilide in admixture with at least one of its position isomers is hydrogenated in a water-miscible organic solvent which optionally contains water. The 5-amino-2,4-dimethylacetanilide is separated off from the reaction mixture by means of crystallization employing a mixture of water-miscible organic solvent and water.
公开了一种通过使用氢还原5-硝基-2,4-二甲基乙酰苯胺制备5-氨基-2,4-二甲基乙酰苯胺的方法,其特征在于将含有5-硝基-2,4-二甲基乙酰苯胺及其至少一种位置异构体的原料混合物在可溶于水的有机溶剂中进行氢化反应,该有机溶剂可以含有水。通过使用可溶于水的有机溶剂和水的混合物结晶的方法,从反应混合物中分离出5-氨基-2,4-二甲基乙酰苯胺。