TEMPERATURE-DEPENDENCE OF THE REACTIVITY OF MONOSUBSTITUTED THIOPHENOLS BY APPLYING THE HYDROGEN-ISOTOPE EXCHANGE-REACTION IN A LIQUID-SOLID SYSTEM

In order to reveal the reactivity of monosubstituted thiophenols, the hydrogen-isotope exchange reaction between T-labeled poly(vinyl alcoho l) and each monosubstituted thiophenol (unlabeled) was studied in a li quid-solid system. Using both the data obtained and the A ''-McKay plo t method, the reaction was analyzed, and the rate constant (k) for the monosubstituted thiophenol has been obtained. Consequently, it has be en found that (1) the higher the temperature is, the larger is the rea ctivity of monosubstituted thiophenols, (2) the temperature dependence of the effect of the substituent (in a monosubstituted thiophenol) on the reactivity of the monosubstituted thiophenol is weak, (3) the rea ctivity of monosubstituted thiophenols follows the Hammett rule, (4) t he reactivity of monosubstituted thiophenols can be enhanced with one of the electron-attractive substituents.