Thermodynamic study of the acid dissociation of substituted pyridinium ions in methanol

1982 ◽  
Vol 78 (4) ◽  
pp. 1303 ◽  
Author(s):  
Colin H. Rochester ◽  
Jane A. Waters
Keyword(s):  
Thermodynamic Study ◽  
Acid Dissociation ◽  
Pyridinium Ions

Evidence for general base catalysis by protic solvents in a kinetic study of alcoholyses and hydrolyses of 1-(phenoxycarbonyl)pyridinium ions under both solvolytic and non-solvolytic conditions

2009 ◽  
Vol 74 (1) ◽  
pp. 43-55 ◽  
Author(s):  
Dennis N. Kevill ◽  
Byoung-Chun Park ◽  
Jin Burm Kyong
Keyword(s):  
Second Order ◽  
Base Catalysis ◽  
Substitution Reactions ◽  
Third Order ◽  
Methoxy Derivative ◽  
First Order ◽  
General Base ◽  
Protic Solvents ◽  
Kinetics Of ◽  
Pyridinium Ions

The kinetics of nucleophilic substitution reactions of 1-(phenoxycarbonyl)pyridinium ions, prepared with the essentially non-nucleophilic/non-basic fluoroborate as the counterion, have been studied using up to 1.60 M methanol in acetonitrile as solvent and under solvolytic conditions in 2,2,2-trifluoroethan-1-ol (TFE) and its mixtures with water. Under the non- solvolytic conditions, the parent and three pyridine-ring-substituted derivatives were studied. Both second-order (first-order in methanol) and third-order (second-order in methanol) kinetic contributions were observed. In the solvolysis studies, since solvent ionizing power values were almost constant over the range of aqueous TFE studied, a Grunwald–Winstein equation treatment of the specific rates of solvolysis for the parent and the 4-methoxy derivative could be carried out in terms of variations in solvent nucleophilicity, and an appreciable sensitivity to changes in solvent nucleophilicity was found.

Thermodynamic Study of Solid and Liquid Ni-In Alloys

1995 ◽  
Vol 86 (12) ◽  
pp. 877-881
Author(s):  
Johannes Schmid ◽  
Marcus Bienzle ◽  
Ferdinand Sommer ◽  
Bruno Predel
Keyword(s):  
Thermodynamic Study

scholarly journals Hemic Acid Dissociation in Whale, Seal, and Porpoise Myoglobins and Their Alkylated Derivatives

1968 ◽  
Vol 243 (4) ◽  
pp. 697-701
Author(s):  
C R Hartzell ◽  
J F Clark ◽  
F R N Gurd
Keyword(s):  
Acid Dissociation
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