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Clethodim
Common name: Clethodim
IUPAC name:
(±-2-[(E)-1-[(E)-3-chloroallyloxyimino]propyl]-5-[2-(ethylthio)propyl]-3-hydroxycyclohex-2-enone
Chemical Abstracts name:    
(E,E)-(?-2-[1-[[(3-chloro-2-propenyl)oxy]imino]propyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-one
CAS RN: [99129-21-2]
 
PHYSICAL CHEMISTRY
Mol. wt.: 359.9
Form:Clear, amber liquid.
B.p.: Decomposes below boiling point.
V.p.: <1×10-2 mPa (20 ºC)
S.g./density: 1.14 (20 ºC)
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 (without photosensitiser), 0.5-1.2 d (with photosensitiser).
 
TOXICOLOGY
Oral Acute oral LD50 for male rats 1630, female rats 1360, male mice 2570, female mice 2430 mg/kg.
Skin and eye 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).
NOEL for mice 30, rats 16, dogs 1 mg/kg daily.
ADI (JMPR) 0.01 mg/kg b.w. ; 0.16 mg/kg (Canada); 0.01 mg/kg (USA).
Toxicity class WHO (a.i.) III
EPA (formulation)  III
 
ECOTOXICOLOGY
Birds Acute oral  LD50 for bobwhite quail >2000 mg/kg. Dietary LC50 for mallard ducks >6000 mg/kg.
Fish LC50 (96 h) for rainbow trout 67, bluegill sunfish >120 mg/l.
Daphnia  LC50 (48 h) >120 mg/l; NOEC 60 mg/l.
Algae EC50 (5 d) for fresh-water algae 57.8 mg/l.
Bees LD50 (contact) >100 mg/bee.
Worms LC50 for worms 454 mg/kg soil; NOEL 316 mg/kg soil.   

 
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