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