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Chemical Identification
Common Name
Diflufenican
中文通用名
吡氟酰草胺
IUPAC
2′,4′-difluoro-2-(α,α,α-trifluoro-m-tolyloxy)nicotinanilide
CAS
N-(2,4-difluorophenyl)-2-[3-(trifluoromethyl)phenoxy]-3-pyridinecarboxamide
CAS No.
83164-33-4
Molecular Formula
C19H11F5N2O2
Molecular Structure
Category
Activity
Diflufenican is a synthetic chemical belonging to the group carboxamide. It acts as residual and foliar herbicide that can be applied pre-emergence and post-emergence.  Diflufenican is a contact, selective herbicide  used to specifically control some broad leaved weeds, like Stellaria media (Chickweed), Veronica Spp (Speedwell),  Viola spp , Geranium spp (Cranesbill) and Laminum spp (Dead nettles). The mode of action of diflufenican is a bleaching action, due to the inhibition of carotenoid biosynthesis, theregy preventing photosynthesis and leading to plant death.
CropUse

Lupins, plantations, rye, triticale, winter barley and winter wheat.

Weed Spectrum
Broadleaf weeds: Stellaria media, Veronica spp., Viola spp., Laminum spp.
Formulation
OD = Oil dispersion
SC = Suspension concentrate (=flowable concentrate)
Premix
Flufenacet+diflufenican
Diflufenican+isoproturon
diflufenican+lodosulfuron-methyl sodium
Flufenacet+Diflufenican+Flurtamone
DIFLUFENICAN+BROMOXYNIL OCTANOATE
DIFLUFENICAN+MCPA ETHYL HEXYL ESTER
Pyrazosulfuron-ethyl+Diflufenican
Diflufenican+Oxyfluorfen
pendimethalin, mecoprop-P, chlorotoluron, bromoxynil and ioxynil sodium, flufenacet, flurtamone, iodosulfuron Methyl sodium, glyphosate, oxadiazon, isoproturon,mcpa, mesosulfuron-methyl, isoproturon, mesosulforon-methyl 9 + iodosulfuron-methyl-sodium + mefenpyr, ioxynil sodium + isoproturon
Physical Properties
Molecular weight:394.3. Physical form:Colourless crystals. Composition: 97% pure. Melting point:159-161 °C; Vapour pressure:4.25×10-3 mPa (25 °C, gas saturation method),0.07 mPa (30°C).; Henry constant:0.033 Pa m3 mol-1; Partition coefficient(n-octanol and water):logP = 4.9; Solubility:In water <0.05 mg/l (25 °C). Soluble in most organic solvents, e.g. acetone, dimethylformamide 100, acetophenone, cyclohexanone 50, isophorone 35, xylene 20, cyclohexane, 2-ethoxyethanol, kerosene <10 (all in g/ kg, 20 °C); Stability:Stable in air up to melting point. At 22 °C, very stable in aqueous solution at pH 5, 7 and 9. Fairly stable to photolysis.
Toxicology
Oral:Acute oral LD50 for rats >2000 mg/kg, mice >1000 mg/kg, rabbits >5000 mg/kg. Percutaneous:Acute percutaneous LD50 for rats >2000 mg/kg. Non-irritating to skin and eyes (rabbits). Inhalation: LC50 (4 h) for rats >2.34 mg/l air. Phytotoxicity:Any slight phytotoxicity is in the form of small transient patches on basal leaves, with no adverse effect on crop develop
Environmental Profile
Ecotoxicology: 
Algae:No growth inhibition of algae (96 h) at 10 mg/l.Bees:Non-toxic by ingestion or contact.Birds:Acute oral LD50 for quail >2150, mallard ducks >4000 mg/kg.Daphnia: LC50 (48 h) - no effect at 10 mg/l.Fish: LC50 (96 h) for rainbow trout 56-100, carp 105 mg/l.Worms:Non-toxic to earthworms. 
Environmental fate: 
Soil:In soil, degradation proceeds via the metabolites 2-(3-trifluoromethylphenoxy)nicotinamide and 2-(3-trifluoromethylphenoxy)nicotinic acid to bound residues and CO2. Half-life varies from 15 to 30 weeks, depending on soil type and water content.Plant:In cereals, rapidly metabolised via the nicotinamide and nicotinic acid to CO2. Following pre-emergence application in autumn, no residues are detectable in the grain and straw after c. 200-250 days.
WATER SOLUBILITY: 0.05 mg/l at 25°C.
Transport Information
Signal Word:CAUTION; Hazard Class:III (Slightly hazardous)

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