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Chemical Identification
Common Name
Pyrazoxyfen
中文通用名
苄草唑
IUPAC
2-[4-(2,4-dichlorobenzoyl)-1,3-dimethylpyrazol-5-yloxy]acetophenone
CAS
2-[[4-(2,4-dichlorobenzoyl)-1,3-dimethyl-1H-pyrazol-5-yl]oxy]-1-phenylethanone
CAS No.
71561-11-0
Molecular Formula
C20H16Cl2N2O3
Molecular Structure
Physical Properties
Molecular weight:403.3; Physical form:Colourless crystals. Density:1.37 (20 °C); Melting point:111-112 °C; Vapour pressure:0.048 mPa (25 °C); Henry constant:2.15 × 10-5 Pa m3 mol-1 (calc.); Partition coefficient(n-octanol and water):logP = 3.69; Solubility:In water 0.9 g/l (20 °C). In acetone 223, benzene 325, ethanol 14, chloroform 1068, hexane 900, xylene 116, toluene 200 (all in g/l, 20 °C).; Stability:Stable to acid, alkali, light and heat.
Toxicology
Oral:Acute oral LD50 for male rats 1690, female rats 1644, mice 8450 mg/ kg. Percutaneous:Acute percutaneous LD50 for rats >5000 mg/ kg. Inhalation:LC50 for rats >0.28 mg/ kg. Phytotoxicity:Non-phytotoxic to rice. Can be used on direct-seeded rice but, at temperatures >35 °C, temporary crop damage may occur.
Environmental Profile
Ecotoxicology: 
Daphnia: LC50 (3 h) 127 mg/l.Fish: LC50 (48 h) for carp 2.5, rainbow trout 0.79, killifish 2.7 mg/l. 

Environmental fate: 
Soil:In soil, DT50 4-15 d. Kd 109-439. WATER SOLUBILITY: 0.9 g/l at 20° C
Transport Information
Signal Word:CAUTION; Hazard Class:III(Slightly hazardous)

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