Kinetic Analysis by High Pressure and High Vacuum Apparatus for the Nucleophilic Substitution Reaction

고압 및 고진공장치를 이용한 친핵성치환반응에 대한 속도론적 분석

  • 김세경 (한양대학교 자연과학대학 화학과)
  • Received : 2004.05.13
  • Accepted : 2004.08.20
  • Published : 2004.10.25

Abstract

Kinetics have been studied by high vacuum and high pressure apparatus under various temperatures and pressures for the nucleophilic substitution reaction. Rate constants, activated parameters and Hammett ${\rho}$-values are determined. The values of ${\Delta}V^{\ddag}$, ${\Delta}{\beta}^{\ddag}$ and ${\Delta}S^{\ddag}$ are all negative. The Hammett ${\rho}$-values are negative for the nucleophile (${\rho}x$) over the pressure range studied. Consequently the rate constant increases as the pressure increases, and some decrease in vacuum. So these reactions proceed in typical $S_N2$ reaction mechanism.

Keywords

high pressure;high vacuum;kinetics

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