Kinetic Studies for the Reaction of p-Methylphenacyl Arenesulfonates with Pyridine under High Pressures

고압하에서 p-Methylphenacyl Arenesulfonate와 피리딘과의 반응메카니즘

  • Yoh Soo-Dong (Department of Chemistry, Teachers College, Kyungpook National University) ;
  • Park Heon-Young (Department of Chemistry, Teachers College, Kyungpook National University) ;
  • Park Jong-Hwan (Department of Chemistry, Teachers College, Kyungpook National University) ;
  • Hwang Jeong-Ui (Department of Chemistry, College of Natural Sciences, Kyungpook National University)
  • 여수동 (경북대학교 사범대학 화학교육과) ;
  • 박헌영 (경북대학교 사범대학 화학교육과) ;
  • 박종환 (경북대학교 사범대학 화학교육과) ;
  • 황정의 (경북대학교 자연과학대학 화학과)
  • Published : 1991.02.20

Abstract

Kinetics of the reaction of p-methylphenacyl arenesulfonates with pyridine in acetonitrile were investigated by an electric conductivity method at 1∼2000 bars and 35∼55$^{\circ}C$. The rates of these reactions were increased with raising pressures and temperatures. The activation enthalpy(${\Delta}H^{\neq}$), entropy(${\Delta}S^{\neq}$) and activation volume(${\Delta}V^{\neq}$) of the reaction were obtained with the rate constants. Activation volume and entropy were both negative valued, and activation enthalpy was positive. The acteivation parameters (${\Delta}V^{\neq}$ and ${\Delta}S^{\neq}$) were decreased with increasing pressure. From all of the above results, it was found that this reaction proceeds on the S$_N$2 in which C${\cdots}$O bond breaking is more advanced as pressure increases.

Keywords

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