Haga, Kazuo published the artcileCondensation of 1,4-cyclohexanediones and secondary aromatic amines. II. N-phenylation of diarylamines, Category: catalysis-chemistry, the publication is Bulletin of the Chemical Society of Japan (1986), 59(3), 803-7, database is CAplus.
Condensations of 1,4-cyclohexanedione with diphenylamines were investigated to determine the limit of the reaction for the N-phenylation of aromatic secondary amines. 4-Ethoxy-, 4,4′-dimethyl-, and 4,4′-dibromodiphenylamines gave their N-phenylated compounds in 65-94% yields, but 4-hydroxy-, 3-ethoxy-, and 4,4′-bis(dimethylamino)diphenylamines gave poor yields. Nitro-substituted diphenylamines gave N-Ph derivatives in low yields along with N-4-hydroxyphenyl derivatives N,N‘-Diphenyl-p-phenylenediamine and N,N‘-diphenylbenzidine gave the corresponding tetra-N-Ph derivatives in 78-80% yields. The condensation of N-phenyl-1-naphthylamine, N-phenyl-2-naphthylamine, di-2-pyridiylamine, phenothiazine, and carbazole with 1,4-cyclohexanedione also were examined
Bulletin of the Chemical Society of Japan 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, Category: catalysis-chemistry.
Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia