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Fenoxaprop-P-Ethyl 95TC and 12%EC/7.5%EW
Fenoxaprop-P-Ethyl 95TC and 12%EC/7.5%EW

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Fenoxaprop-P-Ethyl 95TC and 12%EC/7.5%EW
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Various professional pesticide packing
FAO Standards

Herbicide

NOMENCLATURE
fenoxaprop-P-ethyl
Chemical Abstracts name ethyl (R)-2-[4-[(6-chloro-2-benzoxazolyl)oxy]phenoxy]propanoate 
CAS RN [71283-80-2] 

Common name fenoxaprop-P (BSI, draft E-ISO, (m) draft F-ISO)
IUPAC name (R)-2-[4-(6-chloro-1,3-benzoxazol-2-yloxy)phenoxy]propionic acid; (R)-2-[4-(6-chlorobenzoxazol-2-yloxy)phenoxy]propionic acid 
Chemical Abstracts name (R)-2-[4-[(6-chloro-2-benzoxazolyl)oxy]phenoxy]propanoic acid 
CAS RN [113158-40-0]  

 

PHYSICAL CHEMISTRY
fenoxaprop-P-ethyl
Mol. wt. 361.8  M.f. C18H16ClNO5  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). 

fenoxaprop-P
Mol. wt. 333.7  M.f. C16H12ClNO5  Form Light beige, weakly pungent, fine powder.  M.p. 155-161 °C  V.p. 1.8 ´ 10-1 mPa (20 °C)  KOW logP = 1.83-0.24 (pH 5 - pH 9)  S.g./density c. 1.5 (20 °C)  Solubility In water 0.27 (pH 5.1), 61 (pH 7.0) (both in g/l, 20 °C). In acetone 80, toluene 0.5, ethyl acetate 36, methanol 34 (all in g/l, 20 °C). 

 

APPLICATIONS
fenoxaprop-P-ethyl
Biochemistry Fatty acid synthesis inhibition in grasses, by inhibition of acetyl CoA carboxylase (ACCase).  Mode of action Fenoxaprop-P-ethyl is a selective herbicide with contact and systemic action, absorbed principally by the leaves, with translocation both acropetally and basipetally to the roots or rhizomes.  Uses Post-emergence control of annual and perennial grass weeds in potatoes, beans, soya beans, beets, vegetables, peanuts, flax, oilseed rape, and cotton; and (when applied with the herbicide safener mefenpyr-diethyl) annual and perennial grass weeds and wild oats in wheat, rye, triticale and, depending on ratio, in some varieties of barley.  Phytotoxicity Non-phytotoxic to broad-leaved crops.  Formulation types EC; EW; SE. 

 

MAMMALIAN TOXICOLOGY
fenoxaprop-P-ethyl
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
fenoxaprop-P-ethyl
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. 

 

ENVIRONMENTAL FATE
Plants In plants, fenoxaprop-ethyl is metabolised via fenoxaprop to 6-chloro-2,3-dihydrobenzoxazol-2-one.  Soil/Environment In soil, fenoxaprop-ethyl is rapidly hydrolysed to fenoxaprop (A. E. Smith, J. Agric. Food Chem., 1985, 33, 483); DT50 1-10 d. 

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