Kinetic study by UV Spectrophotometry of Carzol degradation in aqueous medium

Authors

  • Hayet Bakhti Laboratory of Analytical Chemistry and Electrochemistry,Department of Chemistry, University El Manar, Faculty of Science of Tunis, 2092 El Manar, Tunis, Tunisia
  • Najib Ben Hamida Laboratory of Analytical Chemistry and Electrochemistry,Department of Chemistry, University El Manar, Faculty of Science of Tunis, 2092 El Manar, Tunis, Tunisia

DOI:

https://doi.org/10.13171/mjc.3.4.2014.20.07.14

Abstract

This paper deals with the kinetic hydrolysis in aqueous media of Carzol or (E) 3-dimethylamino- methyleneaminophenyl-N-methylcarbamate hydrochloride. The Carzol is a bifunctional compound which belongs to the chemical families formamidine and carbamate. This work is carried out by UV Spectrophotometry. The successive determination of 3-aminophenyl-N-methylcarbamate and 3-aminophenol, as the mainproducts of the formamidine and the carbamate groups of Carzol hydrolysis gives evidence for the significant reactivity of this insecticide-acaricide in aqueous media. The obtained negative activation entropy ΔS≠ = - 32.39 J mol-1K-1 indicates a BAC2 mechanism involving bimolecular collapse of the formamidine group of Carzol. While, the obtained positive activation entropy ΔS≠ = +100.24J mol-1 K-1and the absence of basic general catalysis indicate an E1cB mechanism involving unimolecular collapse of the carbamate group of Carzol via a methylisocyanate intermediate.

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Published

2014-07-20

Issue

Vol. 3 No. 4 (2014)

Section

Analytical Chemistry

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