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Chemical Identification
Common Name
Beflubutamid
中文通用名
氟丁酰草胺
IUPAC
(RS)-N-benzyl-2-(α,α,α,4-tetrafluoro-m-tolyloxy)butyramide
CAS
2-[4-fluoro-3-(trifluoromethyl)phenoxy]-N-(phenylmethyl)butanamide
CAS No.
113614-08-7
Molecular Formula
C18H17F4NO2
Molecular Structure
Category
Activity
Herbicide.
Beflubutamid provides both pre- and post-emergence activity with early post-emergence applications (2-4 leaf stage) showing the most consistent efficacy. Certain problem weeds (e.g. Galium aparine) require early treatment. Following application, weeds exhibit signs of chlorosis. The herbicide is safe to crop at rates several times that of recommended application rate; wheat tolerates doses up to 1000 g/ha while applications to barley are safe to 500 g/ha.
CropUse
Crop uses:
barley, rye, triticale, wheat

Cereals

170-255 g ai/ha

Physical Properties
Molecular weight:355.3; Physical form:Fluffy white powder. Density:1.33; Composition:Tech. is >97%. Melting point:75 °C; Vapour pressure:1.1×10-2 mPa(25 °C); Henry constant:1.1×10-4 Pa m3 mol-1; Partition coefficient(n-octanol and water):logP = 4.28; Solubility:In water 3.29 mg/l (20 °C). In acetone >600, 1,2-dichloroethane >544, ethyl acetate >571, methanol >473, n-heptane 2.18, xylene 106 (all in g/l, 20 °C).; Stability:Stable at 130 °C for 5 h. Stable at pH 5, 7 and 9 for 5 d (21 °C). Fairly stable to photolysis.
Toxicology
Oral:Acute oral LD50 for rats >5000 mg/kg. Percutaneous:Acute percutaneous LD50 for rats >2000 mg/kg. Non-irritating to skin and eyes (rabbits); not a skin sensitiser (guinea pigs). Inhalation:LD50(for rats) >5 ml/l. 
Environmental Profile
Ecotoxicology: 
Algae:EbC50 for Selenastrum 4.45 mg/l.Bees:LD50(oral and contact) >100 mg/bee.Birds:Acute oral LD50 for bobwhite quail >2000 mg/kg. Dietary LC50 for bobwhite quail >5200 ppm.Daphnia:Acute EC50(48 h) 1.64 mg/l.Fish:LC50 (96 h) for bluegill sunfish 2.69, rainbow trout 1.86 mg/l.Worms: LC50(14 d) for earthworms 732 mg/kg.Other aquatic spp.:EC50 for Lemna gibba 0.029 mg/l. Other beneficial spp.:Low risk to soil microflora. Environmental fate: 
Low potential for mobility in soil and rapid degradation minimise potential for leaching into groundwater. Carry-over is not expected after application at approved rates.Animals:The main metabolite is the same as in soil.Soil:Soil DT50 5.4 d; the main metabolite is the corresponding butanoic acid, formed by cleavage of the amide bond; this metabolite is itself rapidly degraded in soil. Koc 852-1793. Stable to hydrolysis atPlant:The main metabolite is the same as in soil.

Bobwhite quail

LD50 >2,000 mg/kg

Bluegill sunfish [96 h]

LC50 2.69 mg/L

Rainbow trout [96 h]

LC50 1.86 mg/L

Daphnia[48 h]

EC501.64 mg/L

Bee

LD50 >100 μg/bee

Earthworm [14 d]

LC50 732 mg/kg

Selenastrum

EbC504.45 μg/L

Lemna

EC500.029 mg/L

Fate in soil:
Degraded chemically and microbially in soil, soil half-life is around 4.5-118 days in laboratory aerobic degradation studies. The adsorption/desorption coefficient (Koc) in soils is 852-1793. There is no phytoxicity to following crops.

Fate in aquatic systems:
Stable to hydrolysis at pH 5-9. In a water/sediment study, beflubutamid degrades with a DT50 of 49-64 days in the water/sediment system and 16-20 days in the water phase.

Transport Information
Hazard Class:O (Obsolete as pesticide, not classified)

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