Dimethylvinphos

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Chemical Identification | General Product Information | Physical & Safety Data

Chemical Identification

Common Name

Dimethylvinphos

中文通用名

甲基毒虫畏

IUPAC

(Z)-2-chloro-1-(2,4-dichlorophenyl)vinyl dimethyl phosphate

CAS

(1Z)-2-chloro-1-(2,4-dichlorophenyl)ethenyl dimethyl phosphate

CAS No.

2274-67-1

Molecular Formula

C₁₀H₁₀Cl₃O₄P

Molecular Structure

General Product Information

Category

Insecticides > Organophosphorus insecticides

Activity

Insecticide

Physical & Safety Data

Physical Properties

Molecular 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.

Toxicology

Oral: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 Profile

Ecotoxicology:
Daphnia: LC₅₀ (24 h) 0.002 ppm.Fish: LC₅₀ (24 h) for carp 2.3 ppm.

Transport Information

Hazard Class:O (Obsolete as pesticide, not classified)