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Kinetic study by UV Spectrophotometry of Carzol degradation in aqueous medium

Hayet Bakhti, Najib Ben Hamida

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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DOI: http://dx.doi.org/10.13171/mjc.3.4.2014.20.07.14

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