Terrier, Francois published the artcileComparison between acidity functions of KOMe and NaOMe in MeOH, Synthetic Route of 1821-27-8, the publication is Comptes Rendus des Seances de l’Academie des Sciences, Serie C: Sciences Chimiques (1966), 263(6), 476-9, database is CAplus.
The following pK values were determined with indicators in KOMe and NaOMe up to 5.5M, resp.: 2,4-dinitrodiphenylamine, 17.16, 17.16; 4,4′-dinitrodiphenylamine 17.49, 17.49; 2,4-dinitroaniline 18.40, 18.35; 4-nitrodiphenylamine 19.62, 19.24; 2,4-dichloro-6-nitroaniline 19.83, 19.36; 2-nitrodiphenylamine 21.36, 20.37; o-nitroaniline 22.30, 21.45; p-nitroaniline 22.40, 21.67. Different solvations of the ions MeOH2 + .qMeOH and MeO-.p-MeOH are postulated. Important divergences appear rapidly between the 2 acidity functions in each of 2 media (Hm = pKa + log c + f[log(MeOH)] and Jm = pKa + log [A-]/[AH]).
Comptes Rendus des Seances de l’Academie des Sciences, Serie C: Sciences Chimiques 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 C7H14N4, Synthetic Route of 1821-27-8.
Referemce:
https://courses.lumenlearning.com/boundless-chemistry/chapter/catalysis/,
Catalysis – Wikipedia