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Fenoxaprop-p-ethyl
Common name: Fenoxaprop-p-ethyl
IUPAC name: ethyl (R)-2-[4-[(6-chloro-2-benzoxazolyl)oxy]phenoxy]propanoate
Chemical Abstracts name: (R)-2-[4-[(6-chloro-2-benzoxazolyl)oxy]phenoxy]propanoic acid 
CAS RN:[71283-80-2]
 
PHYSICAL CHEMISTRY
Mol. wt.: 361.8
Form:White, odourless solid.
M.p.: 89-91 ºC
V.p.: 5.3×10-4 mPa (20 ºC)
Kow logP = 4.58
Henry:2.74×10-4 Pa m3 mol-1 (calc.)
S.g./density: 1.3 (20 °C)
Solubility In water 0.7 mg/l (pH 5.8, 20 ºC). In acetone 200, toluene 200, ethyl acetate >200, ethanol c. 24 (all in g/l, 20 ºC).
Stability Fenoxaprop-P-ethyl is stable for 90 d at 50 ºC. Not sensitive to light. Decomposed by acids and alkalis, DT50 >1000 d (pH 5), 100 d (pH 7), 2.4 d (pH 9) (20 ºC). 
 
TOXICOLOGY
Oral Acute oral LD50 for rats 3150-4000, mice >5000 mg/kg.
Skin and eye Acute percutaneous LD50 for rats >2000 mg/kg.
Inhalation LC50 (4 h) for rats >1.224 mg/l air.
NOEL (90 d) for rats 0.75 mg/kg b.w. daily (10 ppm), mice 1.4 mg/kg b.w. daily (10 ppm), dogs 15.9 mg/kg b.w. daily (400 ppm). 
 
ECOTOXICOLOGY
Birds Acute oral  LD50 for bobwhite quail >2000 mg/kg.
Fish LC50 (96 h) for bluegill sunfish 0.58, rainbow trout 0.46 mg/l.
Daphnia  LC50 (48 h) 0.56 (pH 8.0-8.4), 2.7 (pH 7.7-7.8) (both mg/l).
Algae LC50 (72 h) for Scenedesmus subspicatus 0.51 mg/l.
Bees LC50 (contact) >300 mg/bee; (feed) >1000 mg/bee.
Worms  LC50 (14 d) for Eisenia foetida >1000 mg/kg soil. 
 

 
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