ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 35, Number 1
JKCSEZ 35(1)
February 20, 1991 

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℃. The rates of these reactions were increased with raising pressures and temperatures. The activation enthalpy(△H≠), entropy(△S≠) and activation volume(△V≠) 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 (△V≠ and △S≠) were decreased with increasing pressure. From all of the above results, it was found that this reaction proceeds on the SN2 in which C‥‥O bond breaking is more advanced as pressure increases.