Kinetics of Hydrolysis of S,S,S-Tri-isopropyl Phosphoro-trithioate as Defoliating Agent

Abstract

Hydrolysis of S,S,S-tri-isopropyl phosphoro-trithioate has been studied in acid (0.1 to 6.0 M HCl) and buffer (1.20 to 7.80 pH) in 30% aqueousdioxane mixture v/v. The rates of hydrolysis were lower in buffer solutions but with the rise in acidity the rates increased up to 6.0 M HCl. This is also reported that aryl diesters and triesters usually show maximum hydrolysis at 4.0 M acid. The rise in rate has been found to be due to acid catalysis which is of specific nature. The effects of ionic strength, substrate concentration and solvent effect were studied. Various thermodynamic parameters have also been calculated.