Protonation Equilibrium of 4-Substituted Benzohydroxamic Acids in Mineral Acids.
The protonation equilibria of some 4-substituted benzohydroxamic acids 4-X(C(6)H(4)CONHOH) (X = H, OMe, Cl) have been investigated in aqueous sulfuric, perchloric, and hydrochloric acids at 25 degrees C UV spectrophotometrically. The Hammett acidity function method, the Bunnett-Olsen method, Cox-Yates excess acidity function method, and Marziano-Cimino-Passerini method have been compared in order to rationalize the differences observed between pK(BH)()+ values determined by each method. An attempt has been made to apply multivariate analysis to separate the effect of protonation from the medium effect for benzohydroxamic acid.
Ghosh
Kallol K.
KK
School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur 492 010, India.
Tamrakar
Pankaj
P
Rajput
Surendra K.
SK