Reaction of some triarylmethyl radicals, polyarylalkenes, and 9,10-dihydro-9,10-epidioxyanthracenes with sulphur dioxide; detection of radicals and/or cations derived from the corresponding cation radicals

1978 ◽  
pp. 488 ◽  
Author(s):  
Masatomo Nojima ◽  
Masato Takagi ◽  
Minoru Morinaga ◽  
Gensai Nagao ◽  
Niichiro Tokura
Keyword(s):  
Sulphur Dioxide ◽  
Cation Radicals ◽  
Triarylmethyl Radicals

Paramagnetic Intermediates in Oxidative Coupling Reactions of Tertiary Aromatic Amines in Liquid Sulphur Dioxide

1974 ◽  
Vol 29 (5-6) ◽  
pp. 403-407 ◽  
Author(s):  
M. Donbavand ◽  
H. Möckel
Keyword(s):  
Sulphur Dioxide ◽  
Oxidative Coupling ◽  
Aromatic Amines ◽  
Coupling Reactions ◽  
Oxidation Reactions ◽  
Cation Radicals ◽  
Radical Intermediates ◽  
Liquid Sulphur ◽  
Oxidative Coupling Reactions ◽  
Coupling Processes

Results are presented which complement earlier studies on oxidative coupling processes in aromatic amines and demonstrate strikingly the ease with which such reactions take place in liquid sulphur dioxide. Further, yields and stability of the intermediate cation radicals in this solvent compared with others of similar dielectric constant implies the participation of ionising forces not directly connected with dielectric properties. It is suggested that liquid SO2 may prove a very useful solvent in which to study radical intermediates of many oxidation reactions.

Temporal Patterns of Acidification of Rivers in Nova Scotia and Newfoundland and their Relationship to Sulphate Emissions

1988 ◽  
Vol 23 (4) ◽  
pp. 532-541
Author(s):  
G. D. Howell ◽  
P.E.J. Green ◽  
C.A. Field ◽  
B. Freedman
Keyword(s):  
Statistical Analysis ◽  
Nova Scotia ◽  
Water Chemistry ◽  
Sulphur Dioxide ◽  
Low Ph ◽  
Hydrogen Ion ◽  
Atlantic Canada ◽  
Atmospheric Loading ◽  
Mineral Acids ◽  
Sulphur Dioxide Emission

Abstract Twenty-eight rivers in Atlantic Canada are sampled monthly, and have periods of record dating back as far as 1965. Statistical analysis of water chemistry for rivers in areas of Nova Scotia and Newfoundland that are believed to be sensitive to acidification has revealed that pH was significantly lower during the late 1960’s and early 1970’s. Annual hydrogen ion export for selected rivers was also greater during this period. This period of relatively low pH and large hydrogen ion export corresponds to a peak of North American sulphur dioxide emission, suggesting that these rivers may be responding to atmospheric loading of anthropogenic mineral acids.

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