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Journal of the Korean Chemical Society (JKCS)

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

 
Title
Kinetic Studies on the Mechanism of Hydrolysis of 2-Phenyl-4H, 5H-3-methyl-3-thiazolinium Perchlorate Derivatives

2-Phenyl-4H, 5H-3-methyl-3-thiazolinium Perchlorate 유도체의 가수분해 반응 메카니즘에 관한 반응속도론적 연구
Author
Tae Rin Kim, So Young Lee, Man So Han, Sang Yong Pyun, Seok Hee Lee

김태린, 이소영, 한만소, 변상용, 이석희
Keywords
Abstract
2-PhenyI-4H,5H-3-methyl-3-thiazolinium perchlorate(PTP)유도체들의 가수분해속도상수를 수용액에서 자외선 분광법으로 측정하여 넓은 pH 범위에서 적용될 수 있는 속도식을 구하였다. pH에 따른 속도상수의 변화, 가수분해 생성물의 확인, 일반염기 및 치환기 효과 둥을 바탕으로 반응 메카니즘을 제안하였다, 즉 pH 4.0 이하에서는 물분자의 첨가가 일어나 가수분해가 진행되며, pH 9.0 이상에서는 전형적인 Michael type의 반응이 일어나며, pH 4.5~8.0 사이에서는 이들 두 반응이 경쟁적으로 일어남을 알았다.

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

Page
120 - 126
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