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Common NameDimethylvinphos
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中文通用名甲基毒虫畏
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IUPAC(Z)-2-chloro-1-(2,4-dichlorophenyl)vinyl dimethyl phosphate
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CAS(1Z)-2-chloro-1-(2,4-dichlorophenyl)ethenyl dimethyl phosphate
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CAS No.2274-67-1
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Molecular FormulaC10H10Cl3O4P
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Molecular Structure
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Category
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ActivityInsecticide
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Physical PropertiesMolecular weight:331.5. Physical form:Pale white, crystalline solid. Density:1.26 (25 °C); Composition:Comprises >95.0% (Z)- isomer, <2.0% (E)- isomer. The diethyl ester analogue (mixture of (E)- and (Z)- isomers) is chlorfenvinphos ( q.v.). Melting point:69-70 °C; Vapour pressure:1.3 mPa (25 °C); Partition coefficient(n-octanol and water):logP = 3.12 (25 °C); Solubility:In water 130 ppm (20 °C). In xylene 300-350, acetone 350-400, cyclohexanone 450-500 g/l (20 °C). Stability:Hydrolysis DT50 40 d ( pH 7.0, 25 °C). Unstable in sunlight.
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ToxicologyOral:Acute oral
LD50 for rats 155-210, mice 200-220 mg/kg. Percutaneous:Acute percutaneous LD50 for rats 1360-2300 mg/kg. Inhalation: LC50 (4 h) for male rats 970-1186, female rats >4900 mg/m3. Phytotoxicity:Non-phytotoxic to most crops at recommended doses. Spotting seen on peach leaves. -
Environmental ProfileEcotoxicology:
Daphnia:LC50 (24 h) 0.002 ppm.Fish: LC50 (24 h) for carp 2.3 ppm. -
Transport InformationHazard Class:O (Obsolete as pesticide, not classified)
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