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Kinetics on the Reaction of 6-Chloroquinoline and p-Substituted Benzoylcholrides under High Pressures

고압하에서의 6-클로로퀴놀린과 p-치환 염화벤조일류의 반응에 관한 속도론적 연구

  • Kim, Eung-Ryeol (Department of Chemistry, Hanyang University) ;
  • Im, Jong-Wan (Department of Chemistry, Hanyang University) ;
  • Kim, Se-Gyeong (Department of Chemistry, Hanyang University) ;
  • Go, Yeong-Sin (Department of Science Education, Seoul National University of Education)
  • 김응렬 (한양대학교 자연과학대학 화학과) ;
  • 임종완 (한양대학교 자연과학대학 화학과) ;
  • 김세경 (한양대학교 자연과학대학 화학과) ;
  • 고영신 (서울교육대학교 과학교육과)
  • Published : 2002.06.20

Abstract

The reaction rates of substituted 6-chloroquinoline with p-substituted benzoyichorides $p-CH_3,$ p-H, $p-NO_2$ have been measured by conductometry in acetonitrile, and the constants are determined at various temperatures (10, 15, 20, $25^{\circ}C$) and pressures (1, 200, 500, 1000 bar). From the values of rate constants, the activation parameters (Ea, ${\Delta}V^{\neq}$, ${\Delta}H^{\neq}$, ${\Delta}S^{\neq}$, ${\Delta}G^{\neq}$) and the pressure dependence of Hammett p values were determined. The rate constants increased with increasing temperatures and pressures, and are further increased to introduction to the electron donor substiuents in substrate $(p-NO_2)$ with 6-chloroqinoline. When the activation volume and the activation entropy are all negative And the Hammett p values are positive for the substrate over the pressure and temperature range studied. The results of kinetic studies for pressure and substituent show that thease reactions proceed in typical $S_N2$ reaction mechanism and "associative $S_N2$" in bond formation favored with increasing pressures.

온도 (10, 15, 20, $25^{\circ}C$)와 압력(1, 200, 500, 1000 bar)변화에 따라 p-치환염화벤조일류 ($p-CH_3$, p-H, $p-NO_2$ )와 6-클로로퀴놀린(6-chloroquinoline)의 반응을 아세토니트릴 용매내에서 전기전도도법에 의하여 속도상수 ($k_2$)를 구하였다. 이로부터 여러활성화파라미터-활성화에너지(Ea, ${\Delta}V^{\neq}$, ${\Delta}H^{\neq}$,${\Delta}S^{\neq}$, ${\Delta}G^{\neq}$) 를 구하였으며 또한 기질의 치환기 효과에 따른 Hammentt 반응상수 p를 구하였다. 속도상수는 온도와 압력 증가에 따라 증가하였으며 친핵체인 6-chloroquinoline과 기질에 전자 받게 치환기 ($p-NO_2$)가 치환된 경우 더욱 증가하였다. 이 때 활성화부피(${\Delta}V^{\neq}$), 활성화엔트로피(${\Delta}S^{\neq}$)는 모두 음의 값으로 나타났으며 모든 압력 조건에 따라서 p는 양의 값을 나타내었다. 이러한 속도론적인 연구 결과 전반적인 반응은 $S_N2$반응메카니즘을 따르며, 압력이 증가함에 따라 결합형성이 진전되어지는 반응 메카니즘으로 진행 됨을 알 수 있었다.

Keywords

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  1. SN2 반응에서의 반응메카니즘과 압력과의 상관관계 vol.49, pp.6, 2002, https://doi.org/10.5012/jkcs.2005.49.6.554