METHOD OF PREPARING 4-NITRO AND/OR 4-NITROSODIPHENYL AMINE, METHOD OR PREPARING 4-AMINODIPHENYL AMINE DERIVATIVES, AND METHOD OF PREPARING ALKYLATED P- PHENYLENE DIAMINE DERIVATIVES Russian patent published in 1998 - IPC

FIELD: chemical industry. SUBSTANCE: present invention describes method of preparing 4-ADPhA comprises introducing into reaction aniline or substituted aniline derivatives and nitrobenzene under conditions to produce 4- nitrodiphenylamine, or substituted derivatives thereof, and/or nitrosodiphenylamine, or substituted derivatives thereof, and/or salts thereof, and subsequently reducing one/or both compounds to produce 4-ADPhA substituted derivatives thereof. 4-ADPhA or substituted derivatives thereof are hydroalkylated to form products of p- phenylene diamine or substituted derivatives thereof. Said compounds are useful as antioxidants. EFFECT: more efficient preparation method. 100 cl, 15 tbl