Deuterium Isotope Effects on the Ionization Constant of Acetic Acid in H2O and D2O by AC Conductance from 368 to 548 K at 20 MPa

2011 ◽  
Vol 115 (12) ◽  
pp. 3038-3051 ◽  
Author(s):  
K. M. Erickson ◽  
H. Arcis ◽  
D. Raffa ◽  
G. H. Zimmerman ◽  
P. R. Tremaine
Keyword(s):  
Acetic Acid ◽  
Ionization Constant ◽  
Isotope Effects ◽  
Deuterium Isotope Effects ◽  
Ac Conductance

THE CHROMIC ACID OXIDATION OF ARYL TRIFLUOROMETHYL ALCOHOLS: ISOTOPE AND SUBSTITUENT EFFECTS

1964 ◽  
Vol 42 (2) ◽  
pp. 439-446 ◽  
Author(s):  
Ross Stewart ◽  
Donald G. Lee
Keyword(s):  
Acetic Acid ◽  
Acid Solution ◽  
Chromic Acid ◽  
Isotope Effects ◽  
Acetic Acid Solution ◽  
Substituent Effects ◽  
Acid Oxidation ◽  
Unimolecular Decomposition ◽  
Chromic Acid Oxidation ◽  
Deuterium Isotope Effects

The mechanism of the chromic acid oxidation of eight aryltrmuoromethylcarbinols has been studied in acetic acid solution. Electron-donating substituents accelerate the reaction and a good correlation of rate with σ+ values has been found. The rho value is −1.01. Deuterium isotope effects for the oxidation of five of these compounds have been determined and the magnitude of the isotope effect has been found to correlate inversely with the ease of oxidation of the alcohol.The results are interpreted in terms of a unimolecular decomposition of the chromate ester of the alcohol.

Calorimetric study of deuterium isotope effects in water-acetic acid systems

1980 ◽  
Vol 33 (11) ◽  
pp. 2349 ◽  
Author(s):  
JR Khurma ◽  
DV Fenby
Keyword(s):  
Acetic Acid ◽  
Isotope Effects ◽  
Calorimetric Study ◽  
Excess Enthalpies ◽  
Molar Excess ◽  
Deuterium Isotope Effects

The molar excess enthalpies of water+acetic acid systems are analysed to give the enthalpy of the reaction ������������� 2HA(1)+D2O(1) → 2DA(1)+H2O(1) (A=CH3COO or CD3COO) the value obtained at 298 K is -0.15�0.04 kJ mol-1. Molar excess enthalpies at 298.15 K are reported for the systems H2O+CH3COOH, H2O+CD3COOD, D2O+CH3COOH and D2O+CD3COOD.

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.

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