Chemical Fact Sheet

Chemical Abstract Number (CAS #) 27314132
CASRN 27314-13-2
3(2H)-Pyridazinone, 4-chloro-5-(methylamino)-2-[3-(trifluoromethyl)phenyl]-
Analytical Method EPA Method 645
Molecular FormulaC12H9ClF3N3O

Link to the National Library of Medicine's Hazardous Substances
Database for more details on this compound.

Use Norflurazon controls grasses, sedges, and rushes such as crabgrass, foxtail, goosegrass, barnyardgrass, fall panicum, signalgrass, povertygrass, rice cutgrass, needlegrass, smokegrass, spikerush, annual bluegrass, fescues, ripgut grass, ryegrass, wild barley, witchgrass, and many broadleaf weeds, such as prickly sida, common purslane, ragweed, spurred anoda, carpetweed, Florida purslane, cheeseweed, chickweed, false dandelion, fiddleneck, filaree, horseweed, London rocket, pineappleweed, puncture vine, redmaids, Russian thistle, and Shepherdspurse. Suppression or control for nutsedges, bermudagrass, quackgrass, groundsel, annual morning-glory, cocklebur, common lambsquarters, sowthistle, and pigweed. Norflurazon has practical crop tolerance for cotton, cranberries, citrus, apricots, cherries, filberts, nectarines, peaches, plums, prunes, and walnuts. To control grasses and broadleaf weeds in grape vines, cotton and soybeans , control of grasses, sedges, and broadleaf weeds in cranberries.
Apparent Color Colorless crystalline solid; White crystalline solid; Crystals from alcohol
Odor Odorless
Melting Point 117 deg C
Molecular Weight 303.67
Environmental Fate Terrestrial fate: In sandy loam soil, at 5, 20, and 35 deg C, 4-chloro-5-dimethylamino-2-(alpha,alpha,alpha-trifluoro-m-tolyl)- 3(2H)-pyridazinone dissipation was 10, 80 and 97 percent after 210 days and was converted to its monomethyl and demethylated metabolites. At 20 and 35 deg C, 4-chloro-5-dimethylamino-2-(a,a,a,-trifluoro-m-tolyl)-3(2H)-pyridazinone exhihited a half-life of/ = 50 and 9 days, respectively. The half-life of norflurazon in soil was about 8 months. The demethylated metabolite of norflurazon was observed. TERRESTRIAL FATE: The average half life of norflurazon residues in soil from theDelta and Southeast is 45 to 180 days depending on clay and organic content. TERRESTRIAL FATE: In soil 50% loss occurs in 21-28 days according to soil type and method of application.

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