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Chemical Identification
Common Name
Mefenpyr-diethyl
中文通用名
吡唑解草酯
IUPAC
diethyl (RS)-1-(2,4-dichlorophenyl)-5-methyl-2-pyrazoline-3,5-dicarboxylate
CAS
diethyl 1-(2,4-dichlorophenyl)-4,5-dihydro-5-methyl-1H-pyrazole-3,5-dicarboxylate
CAS No.
135590-91-9
Molecular Formula
C16H18Cl2N2O4
Molecular Structure
Category
Activity
Herbicide Safener.Mefenpyr-diethyl is for post-emergence application with fenoxaprop-P-ethyl. The safener acts in two ways, by facilitating rapid detoxification of the herbicide in crop plants (by stimulating the biosynthesis of glutathione) and by facilitating the hydrolysis of the ethyl ester, leaving the herbicidally active fenoxaprop acid.
CropUse
CropUses:
Wheat, barley ,25-90 g safener/ha
Premix
Iodosulfuron-methyl-sodium+mefenpyr-diethyl
Physical Properties
Molecular weight:373.2; (diacid 317.1); Physical form:White to light beige crystals. Density:c. 1.31 (20 °C); Melting point:50-52 °C; Vapour pressure:6.3 × 10-3 mPa (20 °C); 1.4 × 10-2 mPa (25 °C); Henry constant:2.55 × 10-4 Pa m3 mol-1 (20 °C); Partition coefficient(n-octanol and water):logP = 3.83 ( pH 6.3, 21 °C); Solubility:In water 20 mg/ kg ( pH 6.2, 20 °C). In acetone >500, toluene >400, ethyl acetate >400, methanol >400 (all in g/l, 20 °C).; Stability:Hydrolysed by acids and alkali.;
Toxicology
Oral:Acute oral LD50 for rats and mice >5000 mg/kg. Percutaneous:Acute percutaneous LD50 for rats >4000 mg/kg. Non-irritating to skin and eyes (rabbits); not a skin sensitiser (guinea pigs). Inhalation: LC50 (4 h) for rats >1.32 mg/l. Phytotoxicity:Not phytotoxic. ADI:0.0036 mg/ kg b.w.
Environmental Profile
Ecotoxicology: Algae: EC50 for Navicula pelliculosa 1.65 mg/l. EbC50 (72 h) for Scenedesmus subspicatus 5.8 mg/l.Bees: LD50 (oral, 48 h) >900 mg/bee; (contact) >700 mg/bee.Birds:Acute oral LD50 for Japanese quail >2000 mg/kg.Daphnia: LC50 (48 h) 53 mg/l.Fish: LC50 (96 h) for carp 2.4, rainbow trout 4.2 mg/l.Worms: LC50 (14 d) for Eisenia foetida >1000 mg/kg soil.Other aquatic spp.: EC50 for Lemna gibba >12 mg/l. Environmental fate: Soil:Abiotic hydrolysis DT50 >365 d ( pH 5), 40.9 d ( pH 7), 0.35 d ( pH 9) (25 °C). Photodegradation DT50 2.9 d. Completely mineralised in soil by hydrolysis
Transport Information
Hazard Class:O (Obsolete as pesticide, not classified)

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