Specifications
bromoxynil 96%TCProvide SGS product quality testing report if necessary
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NOMENCLATURE
Common name :bromoxynil octanoate
Classification:agricultural herbicide
IUPAC name 2,6-dibromo-4-cyanophenyl octanoate
Chemical name :2,6-dibromo-4-cyanophenyl octanoate
CAS RN [1689-99-2] EEC no. 216-885-3
PHYSICAL CHEMISTRY
Mol. wt. 403.0 M.f. C15H17Br2NO2 Form Cream, waxy solid. M.p. 45-46 ºC V.p. 1.9 ´ 10-1 mPa (25 ºC) KOW logP = 5.4 Solubility In water 3 mg/l (25 ºC). In chloroform 800, xylene, dimethylformamide 700, ethyl acetate 620, cyclohexanone 550, carbon tetrachloride 500, n-propanol 120, acetone, ethanol 100 (all in g/l, 20-25 ºC). Stability Stable to sunlight and at its m.p.; readily hydrolysed to bromoxynil at pH >9.
APPLICATIONS
Biochemistry Photosynthetic electron transport inhibitor at the photosystem II receptor site; also uncouples oxidative phosphorylation. Mode of action Selective contact herbicide with some systemic activity. Absorbed by the foliage, with limited translocation. Uses Post-emergence control of annual broad-leaved weeds, especially young seedlings of the Polygonaceae, Compositae, and certain Boraginaceae, in cereals, maize, sorghum, flax, onions, garlic, mint, grass-seed crops, turf, and non-crop land. Often used in combination with other herbicides, to extend the spectrum of control. Formulation types EC; SC; WP.
MAMMALIAN TOXICOLOGY
Oral Acute oral LD50 for rats 365, mice 306 mg (formulated)/kg, rabbits 325 mg/kg. Skin and eye Acute percutaneous LD50 for rats >2000, rabbits 1675 mg/kg. NOEL (90 d) for rats 15.6, dogs 5 mg/kg daily. EC hazard R63| Xn; R21/22
ECOTOXICOLOGY
Birds Acute oral LD50 for pheasants 175 mg (formulated)/kg. Fish LC50 (48 h) for rainbow trout 0.15 mg/l. Bees Not toxic to bees.
ENVIRONMENTAL FATE
Animals See plants. Plants Metabolism in plants and animals is by hydrolysis of the ester and nitrile groups, with some debromination occurring (J. H. Buckland, Pestic. Sci., 1973, 4, 149, 689). Soil/Environment In soil, DT50 c. 10 d. Degraded by hydrolysis and debromination to less toxic substances such as hydroxybenzoic acid. For persistence in soil, see Pestic. Sci., 1980, 11, 341.
