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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 48, Number 5
JKCSEZ 48(5)
October 20, 2004

Title	Nucleophile Effects for the Reactions of Nucleophilic Substitution by Pressure and Temperature 친핵성치환반응에서 압력과 온도변화에 따른 친핵체 효과
Author	Se-Kyong Kim, Sung-Yong Choi, Young-Shin Ko 김세경, 최성용, 고영신
Keywords	친핵체, 속도론, 고압, 고진공, 치환기 효과 , Nucleophile, Kinetics, High Pressure, High Vacuum, Substituent Effect
Abstract	고진공 및 고압에서 친핵체변화에 따른 반응을 온도변화에 따라 속도론적으로 연구하였다. 유사1차반응속도상수, 2차반응속도상수, 열역학함수 및 Hammett r 값을 구하였다. DV‡, Db‡ 및 DS‡는 모두 음의 값을 나타내었으며, 모든 압력 조건에서 친핵체의 치환기효과 rX는 음의 값을 나타내었다. 전체적인 반응은 전형적인 SN2 반응메카니즘을 따르며, 압력과 친핵체 변화에 따라 반응메카니즘에 변화가 생김을 알 수 있다. Kinetics for the nucleophiles have been studied under high vacuum and high pressures in various temperatures. Pseudo-first order rate constants, second order rate constants, thermodynamic parameters and Hammett r-values are determined. The values of DV‡, Db‡and DS‡are all negative. The Hammett r-values are negative for the nucleophile (rX) over the pressure range studied. The results of kinetic studies for pressure and nucleophilet show that these reactions proceed in typical SN2 reaction mechanism and change of mechanism.
Page	461 - 466
Full Text	PDF

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