아세토니트릴 용매 중에서 p-methylphenacyl arenesulfonate와 피리딘의 반응을 1∼2000 bars 및 35∼55$^{circ}C$에서 전기전도도법으로 측정하였다. 반응속도는 온도와 압력의 증가에 따라 증가하였으며, 이탈기에 전자받개 치환기가 도입됨에 따라 증가하였다. 활성화엔탄피, 엔트로피 및 부피로부터 이 반응은 전반적으로 S$_N$2 반응으로 진행되나 압력이 증가함에 따라 C${cdots}$O 결합분열이 더욱 진전된 dissociative S$_N$2 반응으로 진행됨을 알 수 있었다.
Kinetics of the reaction of p-methylphenacyl arenesulfonates with pyridine in acetonitrile were investigated by an electric conductivity method at 1∼2000 bars and 35∼55$^{circ}C$. The rates of these reactions were increased with raising pressures and temperatures. The activation enthalpy(${Delta}H^{ eq}$), entropy(${Delta}S^{ eq}$) and activation volume(${Delta}V^{ eq}$) of the reaction were obtained with the rate constants. Activation volume and entropy were both negative valued, and activation enthalpy was positive. The acteivation parameters (${Delta}V^{ eq}$ and ${Delta}S^{ eq}$) 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.
