• Title/Summary/Keyword: O,O-Diethyl-O-(1-phenyl-3-trifluoromethylpyrazol-5-yl)phosphorothioate

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Kinetics and hydrolysis mechanism of insecticide O,O-diethyl-O-(1-phenyl-3-trifluoromethylpyrazol-5-yl)phosphorothioate (Flupyrazofos) (살충제 O,O-diethyl-O-(1-phenyl-3-trifluoromethylpyrazol-5-yl)-phosphorothioate(Flupyrazofos)의 가수분해 반응 메커니즘)

  • Sung, Nack-Do
    • The Korean Journal of Pesticide Science
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    • v.6 no.3
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    • pp.218-223
    • /
    • 2002

  • The rate of hydrolysis of insecticide, O,O-diethyl-O-(1-phenyl-3-trifluoromethylpyrazol-5-yl)phosphorothioate (Flupyrazofos) have been investigated in 25% (v/v) aqueous dioxane (${\mu}=0.1M$) at $45^{\circ}C$. The hydrolysis mechanism of flupyrazofos proceeds through the specific acid ($A_{AC}2$) catalysis below pH 4.0, specific base ($B_{AC}2$) catalysis above pH 11.0 and general acid & base ($B_{AC}2$) catalysis between pH 5.0 and pH 10.0 via trigonal-bipyramidal ($d^2sp^3$) intermediate as evidence by solvent effect ($|m|{\ll}|{\ell}|$), rate equation ($kt=ko+k_H+ [H_3O^+]+k_{OH}[OH^-]$) and product analysis. The half-life ($T\frac{1}{2}$) of hydrolytic degradation in neutral media at $45^{\circ}C$ was ca. 3 months.

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