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NOMENCLATURE Oxyfluorfen
Common name oxyfluorfen (BSI, E-ISO, ANSI, WSSA); oxyfluorfène ((m) F-ISO)
IUPAC name 2-chloro-a,a,a-trifluoro-p-tolyl 3-ethoxy-4-nitrophenyl ether
Chemical Abstracts name 2-chloro-1-(3-ethoxy-4-nitrophenoxy)-4-(trifluoromethyl)benzene
CAS RN [42874-03-3] EEC no. 255-983-0 Development codes RH-2915 (Rohm & Haas)
PHYSICAL CHEMISTRY Oxyfluorfen
Mol. wt. 361.7 M.f. C15H11ClF3NO4 Form Orange, crystalline solid. M.p. 85-90 ºC;
(tech., 65-84 ºC) B.p. 358.2 ºC (decomp.) V.p. (pure a.i.) 0.0267 mPa (25 ºC) KOW
logP = 4.47 S.g./density 1.35 (73 ºC) Solubility In water 0.116 mg/l (25 ºC). Readily
soluble in most organic solvents, e.g. acetone 72.5, cyclohexanone, isophorone 61.5,
dimethylformamide >50, chloroform 50-55, mesityl oxide 40-50 (all in g/100 g, 25 ºC).
Stability No significant hydrolysis in 28 d at pH 5-9 (25 ºC). Decomposed rapidly by
u.v. irradiation; DT50 3 d (room temperature). Stable up to 50 ºC.
APPLICATIONS Oxyfluorfen
Biochemistry Protoporphyrinogen oxidase inhibitor. Mode of action Selective contact
herbicide, absorbed more readily by the foliage (and especially the shoots) than by the
roots, with very little translocation. Uses Control of annual broad-leaved weeds and
grasses in a variety of tropical and subtropical crops, by pre- or post-emergence
application at rates in the range 0.25-2.0 kg/ha. Particular crops include tree fruit
(including citrus), vines, nuts, cereals, maize, soya beans, peanuts, rice, cotton,
bananas, peppermint, onions, garlic, ornamental trees and shrubs, and conifer seedbeds.
Phytotoxicity Soya beans and cotton may be injured by contact with oxyfluorfen.
Formulation types EC; GR. Selected tradenames: 'Goal' (Dow AgroSciences); 'Galigan'
(Makhteshim-Agan)
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