Kinetics and Mechanism of Hydrolysis of Di-S-Butyl Phosphorothioate via Conjugate Acid Species

Abstract

Di-S-butyl phosphorothioate has been made in acid region

(0.1 to 7.0 mol dm^–3) at 98ºC in 10% dioxane-water mixture (v/v).

Ionic strength data up to 3.0 μ requires the participation of conjugate

acid species and to determine theoretical rates. Theoretical rates,

estimated from second empirical term of Debye-Hückel, have been

found in close agreement with experimental rates. Bimolecular

behaviour has been decided by the Arrhenius parameters and by the

analysis of molecularity data. The phosphate diester involves P-S

bond fission which is strengthened by comparative kinetic data.