The thermochemistry of some sulphones. Part 1.—The kinetics of decomposition of dimethyl sulphone, benzyl methyl sulphone and allyl methyl sulphone. The dissociation energies of the bonds R—SO2CH3.

1961 ◽  
Vol 57 (0) ◽  
pp. 1044-1053 ◽  
Author(s):  
W. K. Busfield ◽  
K. J. Ivin
Keyword(s):  
Dissociation Energies ◽  
Kinetics Of Decomposition ◽  
Kinetics Of

Kinetics and Mechanism of Decomposition of 1,3-Bis(4-methylphenyl)triazene Catalyzed with Substituted Benzoic Acids in 25% Aqueous Methanol-General or Specific Catalysis?

1994 ◽  
Vol 59 (9) ◽  
pp. 2029-2041
Author(s):  
Oldřich Pytela ◽  
Taťjana Nevěčná
Keyword(s):  
Benzoic Acids ◽  
Hammett Equation ◽  
Aqueous Methanol ◽  
Mechanism Of Decomposition ◽  
Kinetics Of Decomposition ◽  
Independent Variable ◽  
Amino Derivatives ◽  
Substituted Benzoic Acids ◽  
The Individual ◽  
Kinetics Of

The kinetics of decomposition of 1,3-bis(4-methylphenyl)triazene catalyzed with 13 substituted benzoic acids of various concentrations have been measured in 25 vol.% aqueous methanol at 25.0 °C. The rate constants observed (297 data) have be used as values of independent variable in a series of models of the catalyzed decomposition. For the catalytic particles were considered the undissociated acid, its conjugated base, and the proton in both the specific and general catalyses. Some models presumed formation of reactive or nonreactive complexes of the individual reactants. The substituent effect is described by the Hammett equation. The statistically best model in which the observed rate constant is a superposition of a term describing the dependence on proton concentration and a term describing the dependence on the product of concentrations of proton and conjugated base is valid with the presumption of complete proton transfer from the catalyst acid to substrate, which has been proved. The behaviour of 4-dimethylamino, 4-amino, and 3-amino derivatives is anomalous (lower catalytic activity as compared with benzoic acid). This supports the presumed participation of conjugated base in the title process.

Non-isothermal kinetics of decomposition of AlNH4(SO4)2 · 12H2O by EGA-MS

1996 ◽  
Vol 287 (1) ◽  
pp. 13-23 ◽  
Author(s):  
M. Kamruddin ◽  
P.K. Ajikumar ◽  
S. Dash ◽  
R. Krishnan ◽  
A.K. Tyagi ◽  
...  
Keyword(s):  
Isothermal Kinetics ◽  
Kinetics Of Decomposition ◽  
Kinetics Of
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