ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 12, Number 3
JKCSEZ 12(3)
June 20, 1968 

The rate-constants of the nucleophilic addition reaction of n-butylmercaptan to 3,4-methylenedioxy-β-nitrostyrene were determined at various acidic pH and a rate equation which can be applied over wide pH range was obtained. From this equation, one may conclude that this reaction is started by addition of mercaptan molecule below pH 3, while above pH 6, the overall rate of addition is almost only depend upon the concentration of nitrostyrene and the mercaptide ion. At pH 3∼6, the complex mechanism of this addition reaction can also be fully explained by the rate equation.