申请人:CFPI Agro
公开号:US05981800A1
公开(公告)日:1999-11-09
Preparation process for 4-substituted dinitroanilines of formula ##STR1## in which R.sub.1 is chosen from the group containing the tert-butyl, sulphonamido, trifluoromethyl, methyl-sulphonyl and isopropyl radicals, R.sub.2 and R.sub.3, which are identical to or different from one another, represent a hydrogen atom, a linear or branched alkyl, cycloalkyl, haloalkyl or alkenyl radical containing less than 6 carbon atoms, characterized in that that it comprises successively: a dinitration stage of the 4-substituted phenol corresponding to the sought 4-substituted dinitro-aniline, this dinitration stage being carried out in a reaction medium containing a slight excess of nitrating agent, a sufficient quantity of protons and a catalyst chosen from the group containing the soluble salts of the transition metals of columns IV to XII of the Periodic Table, preferably the soluble salts of Fe.sub.III, Fe.sub.II, Zn.sub.II and Cu.sub.II ions, an O-alkylation stage of the dinitrated 4-substituted phenol obtained in the preceding stage, by means of an alkylating agent, and an amination stage of the 4-substituted dinitrated phenoxy-ether obtained in the preceding stage by using a primary or secondary amine.
配制公式为##STR1##的4-取代二硝基苯胺的制备过程,其中R.sub.1选自包含叔丁基,磺酰胺基,三氟甲基,甲基磺酰和异丙基基团的群体,R.sub.2和R.sub.3,它们相同或不同,代表氢原子,线性或支链烷基,环烷基,卤代烷基或含有少于6个碳原子的烯基基团,其特征在于它包括依次进行以下步骤:将所需的4-取代酚进行二硝化反应,该二硝化反应在反应介质中进行,该反应介质包含轻微过量的硝化试剂,足够的质子和来自周期表IV至XII列的过渡金属的可溶性盐中选择的催化剂,优选Fe.sub.III,Fe.sub.II,Zn.sub.II和Cu.sub.II离子的可溶性盐,通过烷基化剂对前一阶段得到的二硝化4-取代酚进行O-烷基化反应,然后使用一级或二级胺对前一阶段得到的4-取代二硝基苯氧基醚进行氨化反应。