Kornev, K. A. published the artcileN-methyldiphenylamine 4,4-diisocyanate, Application of Bis(4-nitrophenyl)amine, the publication is Ukrainskii Khimicheskii Zhurnal (Russian Edition) (1968), 34(10), 1046-8, database is CAplus.
A mixture of 20.75 g. p-O2NC6H4-NH2, 15.2 g. K2CO3, and 7.8 g. o-HOC6H4COCl, was heated to 200¡ã during 1 hr. and held there for 30 min. before adding 23.6 g. p-ClC6H4NO2. Heating was continued for 12 hrs. forming p-(O2NC6H4)2NH (I), m. 211-12¡ã. I and MeI reacted in Me2CO containing KOH to form (p-O2NC6H4)2NMe, m. 179-80¡ã, reduced to (p-H2NC6H4)2NMe (II), m. 173-4¡ã, with N2H4 and Raney Ni in MeOH. A stream of HCl was passed through a boiling solution of II in PhMe to precipitate the salt. This was cooled and a solution of COCl2 in PhMe was added. COCl2 was passed slowly through the resultant mixture while it was refluxed on an oil bath. The excess COCl2 was removed with a stream of N. On cooling (p-OC-NC6H4)2NMe, m. 59-60¡ã, precipitated This with NH3 and PhNH2 formed MeN(C6H4NHCONH2-p)2, m. 219-21¡ã, and MeN(C6-H4NHCONHPh-p)2, m. 245-7¡ã, resp.
Ukrainskii Khimicheskii Zhurnal (Russian Edition) published new progress about 1821-27-8. 1821-27-8 belongs to catalysis-chemistry, auxiliary class Nitro Compound,Amine,Benzene, name is Bis(4-nitrophenyl)amine, and the molecular formula is C12H9N3O4, Application of Bis(4-nitrophenyl)amine.
Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia