申请人:Merck Patent Gesellschaft mit beschrankter Haftung
公开号:US04474987A1
公开(公告)日:1984-10-02
A process for preparing an N,N-disubstituted p-phenylenediamine of the formula ##STR1## wherein R.sup.1 is alkyl of 1-6 C atoms, R.sup.2 is alkyl of 1-6 C atoms or alkyl of 1-6 C atoms which is substituted by OH, lower alkoxy, a sulfo group or an alkylsulfonamido group and R.sup.3 is hydrogen or lower alkyl or an acid addition salt thereof, comprises adding an alkyl nitrite, as a nitrosation agent, to an aqueous, acid suspension of the corresponding aniline derivative of the formula ##STR2## thereby forming the corresponding N,N-disubstituted p-nitroso-aniline, and subsequently hydrogenating the latter without isolation thereof from the reaction mixture.
一种制备式为##STR1##的N,N-二取代对苯二胺的方法,其中R1是1-6个C原子的烷基,R2是1-6个C原子的烷基或1-6个C原子的烷基,其被OH,较低的烷氧基,磺酰基或烷基磺酰胺基取代,R3是氢或较低的烷基或其酸加成盐,包括向相应的式为##STR2##的苯胺衍生物的水酸性悬浮液中加入烷基亚硝酸盐作为亚硝化试剂,从而形成相应的N,N-二取代对硝基苯胺,随后在不从反应混合物中分离的情况下对其进行氢化。