Reaction of galena in ferric sulphate—sulphuric acid media

1994 ◽  
pp. 125-138 ◽  
Author(s):  
J. E. Dutrizac ◽  
T. T. Chen
Keyword(s):  
Sulphuric Acid ◽  
Ferric Sulphate ◽  
Acid Media

PROTONATION OF THE AMIDE GROUP: I. THE BASICITIES OF SUBSTITUTED BENZAMIDES

1960 ◽  
Vol 38 (9) ◽  
pp. 1518-1525 ◽  
Author(s):  
J. T. Edward ◽  
H. S. Chang ◽  
K. Yates ◽  
Ross Stewart
Keyword(s):  
Sulphuric Acid ◽  
Spectrophotometric Method ◽  
Amide Group ◽  
Benzoic Acids ◽  
Acid Media ◽  
Group I ◽  
Substituted Benzamides ◽  
Hammett Σ Constants

The basicities of benzamide and of 11 meta- and para-substituted benzamides in sulphuric acid media have been determined by a spectrophotometric method. The [Formula: see text] values of the protonated benzamides were found to be proportional to the Hammett σ constants for the substituents, unlike the [Formula: see text] values of the protonated benzaldehydes, acetophenones, and benzoic acids, which are approximately proportional to σ+ constants. The lack of conjugation between the protonated amide group and the ring, which is indicated by these results, is most easily interpreted in terms of N-protonation although O-protonation cannot be completely excluded. Various other aspects of the problem of N- versus O-protonation are also discussed.

Mechanism of reactions of some N 1-substituted biguanides with chromium(VI) in aqueous sulphuric acid media

1988 ◽  
pp. 1557 ◽  
Author(s):  
Rupendranath Banerjee ◽  
Anamika Bhattacharya ◽  
Prabir K. Das ◽  
Amiya K. Chakraburtty
Keyword(s):  
Sulphuric Acid ◽  
Acid Media ◽  
Chromium Vi
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