ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 44, Number 2
JKCSEZ 44(2)
April 20, 2000 

The rate constants for the hydrolysis of 2-phenyl-4H,5H-3-methyl-3-thiazolinium perchlorate(PTP) derivatives were detemined by the use of ultraviolet visible spectrophotometer in water. The rate equations which could be applied over a wide pH ranges were obtained.On the basis of rate equation,hydrolysis product analysis, general base catalysis, and substituent effect, a plausible mechanism of the hydrolysis is proposed: Below pH 4.0, the reaction is initiated by addition of water, while above pH 9.0,Michael type nucleophilic addition t