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Chemical Identification
Common Name
Ethofumesate
中文通用名
乙氧呋草黄
IUPAC
(RS)-2-ethoxy-2,3-dihydro-3,3-dimethylbenzofuran-5-yl methanesulfonate
CAS
2-ethoxy-2,3-dihydro-3,3-dimethyl-5-benzofuranyl methanesulfonate
CAS No.
26225-79-6
Molecular Formula
C13H18O5S
Molecular Structure
Category
Activity
Inhibition of cell division by a reduction of photosynthesis and respiration.Pre-emergence soil residual, post-emergence contact herbicide, selective uses.
CropUse
Beans , beets (fodder, red and sugar), grass seed production, swiss chard, pasture and turf (USA only), grass seed, pasture and turf only Nortron and Tramat.
Weed Spectrum
Broadleaf weeds and grass weeds.
Formulation
EC = Emulsifiable concentrate
SC = Suspension concentrate (=flowable concentrate)
Premix
Ethofumesate+Desmedipham+Phenmedipham
Physical Properties
Molecular weight:286.3; Physical form:White, crystalline solid; ( tech. is a light brown crystalline solid; mild aromatic odour). Density:1.29 (20 °C, tech.); Melting point:70-72 °C; tech., 69-71 °C; Vapour pressure:0.12 to 0.65 mPa (25 °C); Henry constant:3.7 × 10-3 to 6.8 × 10-3 Pa m3 mol-1; Partition coefficient(n-octanol and water):logP = 2.7 ( pH 6.5-7.6, 25 °C); Solubility:In water 50 mg/l (25 °C). In acetone, dichloromethane, dimethyl sulfoxide, ethyl acetate >600, toluene, p-xylene 300-600, methanol 120-150, ethanol 60-75, isopropanol 25-30, hexane 4.67 (all in g/l, 25 °C).; Stability:Stable to hydrolysis in water at pH 7 and 9. At pH 5.0, DT50 940 d, forming the hydroxy analogue. Phototransformed in water, DT50 31 h.
Toxicology
Oral:Acute oral LD50 for rats and mice >5000 mg/ kg. Percutaneous:Acute percutaneous LD50 for rats >2000 mg/kg. Not a skin or eye irritant. Not a skin sensitiser. Inhalation: LC50 (4 h) for rats >3.97 mg/l air. Phytotoxicity:Onions, peas, beans, carrots, and cotton are tolerant to some extent.
Environmental Profile
Ecotoxicology: 
Algae: EC50 3.9 mg/l.Bees: LC50 (contact and oral) >50 μg/bee.Birds:Acute oral LD50 for mallard ducks >3552, bobwhite quail >8743 mg/kg. Dietary LC50 (8 d) for mallard ducks >1082, bobwhite quail >839 mg/ kg Daphnia: EC50 (48 h) 13.52-22.0 mg/l.Fish: LC50 (96 h) for rainbow trout 11.91-20.2, bluegill sunfish 12.37-21.2, mirror carp 10.92 mg/l.Worms: LC50 134 mg/ kg soil.Other aquatic spp.: EC50 (growth) (96 h) for Crassostrea virginica (Eastern oyster) 1.7 mg/l; LC50 (96 h) Mysidopsis bahia (mysid shrimp) 5.4 mg/l.Other beneficial spp.: LD50 for Aleochara bilineata >1250, for Poecilus cupreus and Chrysoperla carnea >2000 g/ ha. 

Environmental fate: 
Animals:Major metabolite is the lactone or free acid form of the respective 2-oxo compound.Soil:Ethofumesate is biologically degraded in soil to transient degradates which are rapidly converted to soil-bound residues and mineralised to CO2. Photodegradation also occurs. DT50 ranges from 10-122 d (lab.) and 84-40Plant:In plants, ethofumesate is metabolised to the 2-hydroxy and 2-oxo derivatives, methanesulfonic acid, and CO2.
Transport Information
Signal Word:CAUTION; Hazard Class:III(Slightly hazardous)

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