Acidity functions and the protonation of weak bases. VIII. Temperature variation of the Hr acidity function in aqueous sulfuric acid

1975 ◽  
Vol 97 (4) ◽  
pp. 760-764 ◽  
Author(s):  
M. J. Cook ◽  
N. L. Dassanayake ◽  
C. D. Johnson ◽  
A. R. Katritzky ◽  
T. W. Toone
Keyword(s):  
Sulfuric Acid ◽  
Temperature Variation ◽  
Acidity Function ◽  
Aqueous Sulfuric Acid ◽  
Weak Bases ◽  
Acidity Functions

scholarly journals RATE ENHANCEMENTS DUE TO AQUEOUS SULFURIC ACID IN Mn (III) OXIDATION OF CERTAIN PURINE ALKALOIDS - KINETIC ANALYSIS OF ACIDITY FUNCTIONS

2021 ◽  
Vol 14 (03) ◽  
Author(s):  
A. Ramakrishna Reddy ◽  
J. Prasad ◽  
M. Bhooshan ◽  
K. C. Rajanna ◽  
A. Panasa Reddy ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Kinetic Analysis ◽  
Aqueous Sulfuric Acid ◽  
Purine Alkaloids ◽  
Acidity Functions

Acidity Dependence of the Tautomeric Equilibrium Between the First Conjugated Acids of 4-Aminoazobenzenes

1979 ◽  
Vol 32 (1) ◽  
pp. 41 ◽  
Author(s):  
S Yamamoto ◽  
Y Tenno ◽  
N Nishimura
Keyword(s):  
Sulfuric Acid ◽  
Tautomeric Equilibrium ◽  
Acid Solutions ◽  
Substituted Anilines ◽  
Aqueous Sulfuric Acid ◽  
Acidity Functions ◽  
Sulfuric Acid Solutions

Acidity functions based upon primary anilines which have no ortho substituents have been established in 20% ethanol-80% aqueous sulfuric acid solutions, and compared with those based upon o-substituted anilines and azobenzenes. It was found that the tautomeric equilibrium between azonium and anilinium forms in 4-aminoazobenzene derivatives invariably shifts to the azonium form with increase in acidity. This observation has been interpreted in terms of acidity functions.

Thiohydantoins. VII. Ionization and ultraviolet spectra of 4-thiohydantoins and 2,4-dithiohydantoins

1969 ◽  
Vol 47 (7) ◽  
pp. 1117-1122 ◽  
Author(s):  
J. T. Edward ◽  
J. K. Liu
Keyword(s):  
Sulfuric Acid ◽  
Acid Solution ◽  
Dissociation Constants ◽  
Acid Media ◽  
Ultraviolet Spectra ◽  
Aqueous Sulfuric Acid ◽  
Different Types ◽  
Acid And Base ◽  
Methyl Derivatives ◽  
Acidity Functions

The acid and base dissociation constants of 5,5-pentamethylene-4-thiohydantoin, 5,5-pentamethylene-2,4-dithiohydantoin, and their 1-methyl derivatives, have been determined by ultraviolet studies in basic and acid media. In aqueous sulfuric acid the 4-thiohydantoins are protonated on oxygen at the 2-position, so that the extent of protonation varies with the HA function of the acid solution, while the 2,4-dithiohydantoins are protonated on sulfur at the 2-position, so that the extent of their protonation varies with H0′′′. The importance of using acidity functions appropriate to the different types of compounds when comparing their basicities is emphasized.

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