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Chemical Identification
Common Name
Clethodim
中文通用名
烯草酮
IUPAC
(5RS)-2-{(E)-1-[(2E)-3-chloroallyloxyimino]propyl}-5-[(2RS)-2-(ethylthio)propyl]-3-hydroxycyclohex-2-en-1-one
CAS
2-[(1E)-1-[[[(2E)-3-chloro-2-propenyl]oxy]imino]propyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-one
CAS No.
99129-21-2
Molecular Formula
C17H26ClNO3S
Molecular Structure
Category
Activity
Herbicide
Premix
Haloxyfop-P-methyl+Clethodim
Clopyralid+Clethodim+Picloram
Metribuzin+Clethodim+Rimsulfuron
Physical Properties
Molecular weight:359.9; Physical form:Clear, amber liquid. Density:1.14 (20 °C); Composition:Tech. is >91% pure. Vapour pressure:<1×10-2 mPa (20 °C); Solubility:Soluble in most organic solvents. Stability:Aqueous hydrolysis DT50 28 d (pH 5), 300 d (pH 7), 310 d (pH 9). Aqueous photolytic DT50 (sterile buffers, pH 5, 7 and 9) 1.7-9.6 d.
Toxicology
Oral:Acute oral LD50 for male rats 1630 mg/kg, female rats 1360 mg/kg, male mice 2570 mg/kg, female mice 2430 mg/kg. Percutaneous:Acute percutaneous LD50 for rabbits >5000 mg/kg. Moderate skin irritant (rabbits). Not a skin sensitiser (guinea pigs). Inhalation:LC50 (4 h) for rats >3.9 mg/l (total aerosol). Phytotoxicity:Good tolerance in broad-leaved crops.
Environmental Profile
Ecotoxicology: 
Algae:EC50 (5 d) for fresh-water algae 57.8 mg/l.Bees:LD50(contact) >100 μg/bee.Birds:Oral LD50 for bobwhite quail >2000 mg/kg. Dietary LC50 for mallard ducks >6000 mg/kg.Daphnia:LC50 (48 h) >120 mg/l; NOEC 60 mg/l.Fish:LC50 (96 h) for rainbow trout 67, bluegill sunfish >120 mg/l.Worms: LC50 for worms 454 mg/kg soil; NOEL 316 mg/kg soil. 
Environmental fate: 
Animals:Metabolised to the sulfoxide and sulfone.Soil:Aerobic DT50 in soil 1-3 d. Kd0.08-1.6 (5 soil types).Plant:Metabolised to the sulfoxide, sulfone and S-methyl sulfoxide.
Transport Information
Signal Word:WARNING; Hazard Class:II (Moderately hazardous)

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