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Solvolyses of t-Butyl Halides in Binary Mixtures of Methanol with 1,2-Dimethoxyethane, 1,2-Dichloroethane and Pyridine

  • Yeol Sakong (Department of Chemistry, Hanyang University) ;
  • Shi Choon Kim (Department of Chemistry, Hanyang University) ;
  • Jin Sung Kim (Department of Chemistry, Hanyang University) ;
  • Ikchoon Lee (Department of Chemistry, Inha University)
  • Published : 1990.04.20

Abstract

The Gutmann acceptor number(AN), solvatochromic parameters $({\alpha},{\beta}\;and\;{\pi}^{\ast})$ and hydrogen bonding equilibrium constants (KHB) were determined for three binary systems of methanol with 1,2-dimethoxyethane(DME), 1,2-dichloroethane(DCE) and pyridine (PYD). The solvolysis rate constants of t-butyl chloride, bromide and iodide were also determined in the three binary systems. Solvent properties and solvolysis rates have been discussed in the light of various solvent parameters. Solvolysis of t-butyl halides are most conveniently explained by the two-stage mechanism involving ion-pair intermediate with the ion-pair formation for chloride and ion pair dissociation for iodide as rate limiting.

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