scholarly journals Relation between Specific Acid-Base Catalysis Rate Constants and pH in Organic Solvent-Water Mixture

1974 ◽  
Vol 94 (9) ◽  
pp. 1161-1166
Author(s):  
TSUKINAKA YAMANA ◽  
YUZO MIZUKAMI ◽  
AKIRA TSUJI ◽  
OSAMU NAKANO
Keyword(s):  
Organic Solvent ◽  
Rate Constants ◽  
Base Catalysis ◽  
Water Mixture ◽  
Acid Base ◽  
Solvent Water

Establishing Composition of Organic Solvent-Water Mixture in Analytical Precipitations

1954 ◽  
Vol 26 (7) ◽  
pp. 1156-1158 ◽  
Author(s):  
R. E. Jentoft ◽  
R. J. Robinson
Keyword(s):  
Organic Solvent ◽  
Water Mixture ◽  
Solvent Water

Transport rate constants and transport rate parameters in various organic solvent—water systems

1982 ◽  
Vol 13 (1) ◽  
pp. 75-87 ◽  
Author(s):  
F.H.N. de Haan ◽  
T. de Vringer ◽  
J.T.M. van de Waterbeemd ◽  
A.C.A. Jansen
Keyword(s):  
Organic Solvent ◽  
Rate Constants ◽  
Water Systems ◽  
Transport Rate ◽  
Solvent Water

Mechanism of hydration and isomerisation of 4-ethylidene-2,6-di-tert-butyl-2,5-cyclohexadien-1-one. Kinetics, acid-base catalysis and solvent deuterium isotope effects

1979 ◽  
Vol 44 (1) ◽  
pp. 110-122 ◽  
Author(s):  
Jiří Velek ◽  
Bohumír Koutek ◽  
Milan Souček
Keyword(s):  
Aqueous Medium ◽  
Rate Equation ◽  
Kinetic Data ◽  
Isotope Effects ◽  
Base Catalysis ◽  
Quinone Methide ◽  
Reaction Products ◽  
Acid Base ◽  
Deuterium Isotope Effects ◽  
Hydroxybenzyl Alcohol

Competitive hydration and isomerisation of the quinone methide I at 25 °C in an aqueous medium in the region of pH 2.4-13.0 was studied spectrophotometrically. The only reaction products in the studied range of pH are 4-hydroxybenzyl alcohol (II) and 4-hydroxystyrene (III). The form of the overall rate equation corresponds to a general acid-base catalysis. The mechanism of both reactions for three markedly separated pH regions is discussed on the basis of kinetic data and solvent deuterium effect.

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.

The mechanism of acid-base catalysis

1991 ◽  
Vol 27 (6) ◽  
pp. 615-619
Author(s):  
K. K. Kalninysh
Keyword(s):  
Base Catalysis ◽  
Acid Base
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