scholarly journals Corrigenda - Acid-Base Relationships and Tautomeric Equilibria in m-Aminobenzoic Acid, 3-Amino-1-naphthoic Acid, and 4-Amino-2-naphthoic Acid

1961 ◽  
Vol 14 (2) ◽  
pp. 237
Author(s):  
A Bryson ◽  
RW Matthews
Keyword(s):  
Aminobenzoic Acid ◽  
Acid Base ◽  
Tautomeric Equilibria ◽  
Naphthoic Acid

Acid-Base Relationships and Tautomeric Equilibria in m-Aminobenzoic Acid, 3-Amino-1-naphthoic Acid, and 4-Amino-2-naphthoic Acid

1961 ◽  
Vol 14 (2) ◽  
pp. 237 ◽  
Author(s):  
A Bryson ◽  
RW Matthews
Keyword(s):  
Aqueous Solution ◽  
Methyl Esters ◽  
Ionization Constants ◽  
Aminobenzoic Acid ◽  
Naphthalene Ring ◽  
Acid Base ◽  
Tautomeric Equilibria ◽  
Naphthoic Acid

The first and second ionization constants have been determined in aqueous solution of m-aminobenzoic acid, 3-amino-1-naphthoic acid, and 4-amino-2-naphthoic acid. From published values of the ionization constants for the methyl esters, the ionization constants have been evaluated for the four equilibria involved in each case and estimates have been made of the effects of the substituents NH3+ and NH2 on the ionization of the COOH, and of the substituents COOH and COO- on the ionization of the NH3+ group. These values and the tautomeric constants are interpreted in terms of structure and are discussed in relation to previous studies on substitution in the naphthalene ring.

Pulse polarographic study of the behaviour of some o,o'-dihydroxyazo-compounds

1989 ◽  
Vol 54 (5) ◽  
pp. 1219-1226 ◽  
Author(s):  
Enric Casassas ◽  
Miquel Esteban ◽  
Santiago Alier
Keyword(s):  
Carboxylic Acid ◽  
Reaction Mechanisms ◽  
Sulphonic Acid ◽  
Base Catalysis ◽  
Polarographic Study ◽  
Acid Base ◽  
Eriochrome Black T ◽  
Naphthoic Acid ◽  
Calcon Carboxylic Acid

The reduction of several o,o'-dihydroxyazo-compounds is studied by means of pulse polarographic techniques (DPP, NPP and RPP). The compounds studied are the following: 2-(2'-hydroxyphenylazo)-phenol (o,o'-dihydroxyazobenzene), 1-(2'-hydroxy-1'-naphthylazo)-2-naphthol-4-sulphonic acid (calcon or Eriochrome Blue Black R), 1-(2'-hydroxy-4'-sulpho-1'-naphthylazo)-2-hydroxy-3-naphthoic acid (calcon carboxylic acid), and 1-(1'-hydroxy-2'-naphthylazo)-6-nitro-2-naphthol-4-sulphonic acid (Eriochrome Black T). Correlations between Ip and Epand experimental variables (pH, T, conc.) and instrumental parameters (dropping time, t, and pulse magnitude, ΔE) are established. Reaction mechanisms formerly proposed are discussed on the basis of the new obtained results, and the ranges are defined where adsorption and/or acid-base catalysis are operative.

ChemInform Abstract: 13C NMR Study of Acid-Base Tautomeric Equilibria

ChemInform ◽  
1987 ◽  
Vol 18 (32) ◽  
Author(s):  
L. M. SCHWARTZ ◽  
R. I. GELB ◽  
J. MUMFORD-ZISK ◽  
D. A. LAUFER
Keyword(s):  
13C Nmr ◽  
Acid Base ◽  
Tautomeric Equilibria ◽  
Nmr Study
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