Abstract
Kinetic studies of the reaction of benzyl benzenesulfonate with pyridine in acetone were carried out by the electric conductivity method under 1 to 2000 bars and at 20 to $40^{\circ}C$. The rate increases with increasing pressure and temperature. The activation enthalpy $({\Delta}H^{\neq}),\;entropy\;({\Delta}S^{\neq})$ and activation volume $({\Delta}V^{\neq})$ of the reaction are obtained by the above experiment. The isokinetic relationship between $({\Delta}H^{\neq})\;and\;({\Delta}S^{\neq})$ for pressure change in the reaction was shown, and its isokinetic temperature was $342^{\circ}K$. From all of the above results it was found that this reaction precedes on the $S_N2$ reaction mechanism in which the rate of the reaction was determined by $C{\cdots}N$ bond formation at transition state.
Benzyl benzenesulfonate와 피리딘의 반응속도를 아세톤 용매중에서 20∼$40^{\circ}C$ 및 1∼2000 bars에서 전기전도도법으로 측정하였다. 반응속도는 온도 및 압력이 증가함에 따라 증가하였다. 이 반응의 활성화엔탈피$({\Delta}H^{\neq})$, 엔트로피$({\Delta}S^{\neq})$ 그리고 활성화부피$({\Delta}V^{\neq})$를 구하였다. 이 반응에서 압력변화에 대한 $({\Delta}H^{\neq})$와 $({\Delta}S^{\neq})$사이에 등속관계가 성립하였으며 등속온도는 $342^{\circ}K$였다. 이상의 결과로 본 반응은 전이상태에서 $C{\cdots}N$ 결합형성이 주로 반응속도를 결정하는 $S_N2$ 반응 메카니즘으로 진행된다는 것을 알았다.