Nucleophile Effects for the Reactions of Nucleophilic Substitution by Pressure and Temperature 


Vol. 48,  No. 5, pp. 461-466, Oct.  2004
10.5012/jkcs.2004.48.5.461


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  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.

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  Cite this article

[IEEE Style]

S. Kim, S. Choi, Y. Ko, "Nucleophile Effects for the Reactions of Nucleophilic Substitution by Pressure and Temperature," Journal of the Korean Chemical Society, vol. 48, no. 5, pp. 461-466, 2004. DOI: 10.5012/jkcs.2004.48.5.461.

[ACM Style]

Se-Kyong Kim, Sung-Yong Choi, and Young-Shin Ko. 2004. Nucleophile Effects for the Reactions of Nucleophilic Substitution by Pressure and Temperature. Journal of the Korean Chemical Society, 48, 5, (2004), 461-466. DOI: 10.5012/jkcs.2004.48.5.461.

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ISSN(Print) 1017-2548
ISSN(Online) 2234-8530