Los, Johannes published the artcileHydrolytic dissociation constants of substituted 4-aminobenzoic acids, SDS of cas: 5204-46-6, the publication is Recueil des Travaux Chimiques des Pays-Bas (1967), 86(6), 609-21, database is CAplus.
The 4 individual pK values for 4-aminobenzoic acid, the following acids of the general formula 2,6,4-X(Y)(H2N)C6H2CO2H (X and Y given): H, Me; H, Cl; H, Br; H, NO2; H, OH; H, MeO; Me, Me; Et, Et; Cl, Cl; Br, Br; and 3,4-Br(H2N)C6H3CO2H are calculated from the pKI and pKII values. The hydrolytic dissociation constants, KI and KII, are determined in aqueous solutions at 50°. The effect of the CO2H group on the NH3+ → NH2 dissociation is discussed; large ΔpK1′ values are obtained for most of the acids. The effect of the CO2- group on the NH3+ → NH2 dissociation and mesomeric stabilization by CO2H and CO2- are also discussed.
Recueil des Travaux Chimiques des Pays-Bas published new progress about 5204-46-6. 5204-46-6 belongs to chlorides-buliding-blocks, auxiliary class Chloride,Carboxylic acid,Amine,Benzene, name is 4-Amino-2,6-dichlorobenzoic acid, and the molecular formula is C7H5Cl2NO2, SDS of cas: 5204-46-6.
Referemce:
https://en.wikipedia.org/wiki/Chloride,
Chlorides – an overview | ScienceDirect Topics