Alkaline hydrolysis of ethiofencarb: Kinetic study and mechanism degradation

Authors

  • Randa Ouertani,

    1. Laboratoire de Chimie Analytique et Electrochimie, Département de Chimie, Faculté des Sciences de Tunis, 2092 El Manar, Tunis, Tunisia
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  • Latifa Latrous El Atrache,

    Corresponding author
    1. Laboratoire de Chimie Analytique et Electrochimie, Département de Chimie, Faculté des Sciences de Tunis, 2092 El Manar, Tunis, Tunisia
    • Laboratoire de Chimie Analytique et Electrochimie, Département de Chimie, Faculté des Sciences de Tunis, 2092 El Manar, Tunis, Tunisia
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  • Nejib Ben Hamida

    1. Laboratoire de Chimie Analytique et Electrochimie, Département de Chimie, Faculté des Sciences de Tunis, 2092 El Manar, Tunis, Tunisia
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Abstract

The present paper deals with the hydrolysis of ethiofencarb [2-ethylthiomethyl(phenyl)-N-methylcarbamate] in alkaline solution. The reaction kinetics has been investigated using spectrophotometric and liquid chromatographic techniques. The rate constants were determined following a proposed first-order kinetic model. The positive activation entropy Δ S = +100.07 J mol−1 K−1 and the absence of general basic catalysis indicated an E1cB hydrolytic mechanism, involving the formation of methyl isocyanate. This result was confirmed by the fact that ethiofencarb fits well into Brönsted and Hammett lines, obtained for a series of substituted N-methylcarbamate whose decomposition in aqueous media was established to follow an E1cB mechanism. © 2012 Wiley Periodicals, Inc. Int J Chem Kinet 45: 118–124, 2013

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