Preparation of bis-(aminophenyl) ethers from (N-acetyl) aminophenols or their phenolates
申请人:MALLINCKRODT, INC.(a Missouri corporation)
公开号:EP0105660A1
公开(公告)日:1984-04-18
@ Bis-(aminophenyp ethers are prepared by effecting condensation reaction of an (N-acetyl)-aminophenol or the corresponding sodium or potassium (N-acetyl)-aminophenate with a halonitrobenzene under condensation reaction conditions to form an (N-acetyl)-aminophenyl nitrophenyl ether and hydrogenating the nitro group thereof under nitro- group hydrogenation conditions to form an (N-acetyl)-bis-(aminophenyl) ether. The latter compound is hydrolyzed with aqueous mineral acid under acid hydrolysis conditions to form an acidic aqueous dispersion of the bis-(aminophenyl) ether product, which can readily be recovered from the dispersion. Final bis-(aminophenyl) ether products thus prepared are typically of high purity and excellent colour properties, i.e., substantially colourless.
在缩合反应条件下,(N-乙酰基)-氨基苯酚或相应的(N-乙酰基)-氨基苯酸钠或钾与卤化硝基苯发生缩合反应,生成(N-乙酰基)-氨基苯基硝基苯醚,并在硝基氢化条件下将其硝基氢化,生成(N-乙酰基)-双(氨基苯基)醚。后一种化合物在酸水解条件下与矿物酸水溶液进行水解,形成双(氨基苯基)醚产品的酸性水分散液,该分散液可以很容易地从分散液中回收。这样制备的最终双(氨基苯基)醚产品通常具有高纯度和极佳的颜色特性,即基本无色。