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Chemical Identification
Common Name
Dimefuron
中文通用名
噁唑隆
IUPAC
3-[4-(5-tert-butyl-2,3-dihydro-2-oxo-1,3,4-oxadiazol-3-yl)-3-chlorophenyl]-1,1-dimethylurea
CAS
N′-[3-chloro-4-[5-(1,1-dimethylethyl)-2-oxo-1,3,4-oxadiazol-3(2H)-yl]phenyl]-N,N-dimethylurea
CAS No.
34205-21-5
Molecular Formula
C15H19ClN4O3
Molecular Structure
Physical Properties
Molecular weight: 338.8. Physical form: Colourless, odourless crystals. Melting point:193 °C; Vapour pressure:0.1 mPa (20 °C); Henry constant:2.12×10-3 Pa m3 mol-1 ( calc.); Partition coefficient(n-octanol and water):logP = 2.51; Solubility:In water 16 mg/l (20 °C). Readily soluble in chloroform. Moderately soluble in acetone, acetonitrile, acetophenone and ethanol. Slightly soluble in benzene, toluene and xylene.; Stability:Stable in aqueous solution in acidic conditions.
Toxicology
Oral:Acute oral LD50 for rats >5000, mice >10,000 mg/kg, dogs >2000 mg/kg. Percutaneous:Acute percutaneous LD50 for rats >2000 mg/kg. Non-irritant to eyes and skin (rabbits).
Environmental Profile
Ecotoxicology: 
Bees:Non-toxic to bees. LD50 (48 h) (contact) >500 µg formulation/bee; (oral) >2563 µg formulation/bee.Birds:Non-toxic to birds.Fish: LC50 (96 h) for rainbow trout and bluegill sunfish >1000 mg/l. 
Environmental fate: 
Animals:Metabolites include desmethylaminodimefuron, monomethylamino-tert-butylhydroxydimefuron and monomethylaminodimefuron.Soil:Residual activity persists in soil for 3-6 months, following application in late autumn or winter. Microbial degradation increases rapidly in the spring as the temperature rises. Kdes 19.0-44.9 (4 soil types), Koc 13Plant:Metabolites include N-demethyldimefuron and N-didemethyldimefuron.
Transport Information
Signal Word:CAUTION; Hazard Class:III (Slightly hazardous)

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