申请人:Mitsui Toatsu Chemicals, Inc.
公开号:US04625062A1
公开(公告)日:1986-11-25
4-Alkoxyanilines are obtained industrially advantageously by catalytically hydrogenating a nitrobenzene in the presence of a noble metal catalyst in a mixed solvent containing a lower aliphatic alcohol, sulfuric acid, and water or a lower aliphatic carboxylic acid or both to induce hydrogenation and a Bamberger-type rearrangement reaction. The mixed solvent contains at least 10 moles, preferably 30 to 60 moles, of the lower aliphatic alcohol per mole of the nitrobenzene, 1 to 10 moles, preferably 2 to 7 moles, of sulfuric acid per mole of the nitrobenzene, and 2 to 30% by weight, preferably 3 to 10% by weight, of water, the lower aliphatic carboxylic acid or both.
4-烷氧基苯胺可以在贵金属催化剂存在下,在含有低级脂肪醇、硫酸和水或低级脂肪酸或两者的混合溶剂中催化氢化硝基苯并引发重排反应来工业上获得。混合溶剂中至少含有低级脂肪醇的10摩尔,优选为每摩尔硝基苯的30至60摩尔,每摩尔硝基苯含有1至10摩尔的硫酸,优选为每摩尔硝基苯的2至7摩尔,以及2至30重量%的水、低级脂肪酸或两者,优选为每摩尔硝基苯的3至10重量%。