ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 30, Number 3
JKCSEZ 30(3)
June 20, 1986 

The rate constants for the solvolysis reactions of p-methoxybenzylchloride in ethanol-water mixtures were determined at 2°and 10℃ up to 1600bar. Rates of reaction were increased with increasing temperature and pressure, and decreased with increasing solvent composition of ethanol mole fraction. From the rate constants, the values of the activation parameters (ΔVo≠, Δβ≠, ΔH≠, and ΔS≠) were evaluated. The values of ΔVo≠ and Δβ≠ exhibit the extremum behavior at about 0.30 mole fraction of ethanol. This behavior is discussed in terms of solvent structure variation. From these results, it could be postulated that the reaction proceeds through SN1 mechanism.