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WJPR

World Journal of Pharmaceutical Research

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An International Peer Reviewed Journal for Pharmaceutical and Medical Research and Technology

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Abstract

KINETICS AND MECHANISM OF HYDROLYSIS OF MONO-4- CHLOROTHIOPHENYL PHOSPHATE ESTER VIA CONJUGATE ACID SPECIES

Asha Verma and Firdous Andleep*

Abstract

Hydrolysis of Mono-4-chlorothiophenyl phosphate ester has been carried out in acid region from 0.1- 6.0 mol dm-3 HCl at 980C in aqueous dioxan medium 10 percent (V/V). Ionic strength data exhibits different contribution of conjugate acid species and presence of acid catalysis. Theoretical rates agree well with the experimentally observed rates. Bimolecularity of the reaction is supported by using various concepts and hypothesis like Hammet acidity function, Zucker- Hammet, Bunnet, Bunnet –Olsen, Arrhenius parameters and solvent effect. The monoester involves P-S bond fission which is strengthened by comparative kinetic data.

Keywords: Mono-4-chlorothiophenyl phosphate, conjugate acid species, bimolecularity, monoester.

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