Production of high-quality aromatic amino azo compounds by the rearrangement of 1,3-diaryl triazenes
申请人:E.I. DU PONT DE NEMOURS AND COMPANY
公开号:EP0013643A1
公开(公告)日:1980-07-23
A 1,3-diaryl triazene, in a solution obtained by the diazotization-coupling of a primary aromatic monoamine with a gas containing NO and NO2, which solution contains the monoamine and up to about 30 percent by weight of the triazene, based on the weight of the solution, is contacted with 0.4-2.0 percent of a strong acid, preferably nitric acid (based on the weight of the triazene-containing solution), at 50-120°C. The triazene rearranges to an aromatic amino azo compound in a high para/ortho isomer ratio with minimum formation of binuclear by-products.
将初级芳香族单胺与含有 NO 和 NO2 的气体重氮化偶联得到的溶液中的 1,3-二基三嗪(该溶液含有单胺和高达约 30%(重量)的三嗪(以溶液重量为基准))与 0.4-2.0%的强酸,最好是硝酸(以含三嗪溶液重量为基准)在 50-120°C 下接触。三嗪重新排列为芳香族氨基偶氮化合物,对位/正位同分异构比例高,双核副产物的生成量最小。