JOURNAL of the Tunisian Chemical Society

serving the Research, the Education and the Industry

Etude cinétique par HPLC/UV de la dégradation d’un carbamate insecticide, l’Aminocarb en milieu aqueux

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This paper deals with the kinetic hydrolysis mechanism of Aminocarb, the 3-methyl-4-dimethylaminophenyl-N-methylcarbamate in aqueous media. This work is carried out by reversed phase Liquid Chromatography and LC-MS. The determination of 3-methyl-4-dimethylamino-phenol, as the main product of Aminocarb hydrolysis gives evidence by LC-MS. The obtained positive activation entropy ΔS = + 31.3 J mol-1 K-1 indicated an E1cB mechanism involving unimolecular collapse of the Aminocarb via a methylisocyanate intermediate. This elimination process is confirmed by the position of the point corresponding to the Aminocarb on the Br?nsted and Hammett lines, determined for a serie of substituted N-methylcarbamate which the decomposition mechanism in aqueous media procede via E1cB.

F. Boujelbane, N. Ben Hamida

Aminocarb, degradation, mechanism, LC-ESI-MS

Pages 43-51

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