Chemical Identification
Common Name
Flumiclorac-pentyl
中文通用名
氟烯草酸
IUPAC
pentyl [2-chloro-5-(cyclohex-1-ene-1,2-dicarboximido)-4-fluororophenoxy]acetate
CAS
pentyl [2-chloro-4-fluoro-5-(1,3,4,5,6,7-hexahydro-1,3-dioxo-2H-isoindol-2-yl)phenoxy]acetate
CAS No.
87546-18-7
Molecular Formula
C21H23ClFNO5
Molecular Structure
Category
Activity
Herbicide
Flumiclorac-pentyl is absorbed rapidly by foliage resulting in wilting, chlorosis and necrosis of the leaves within 24 hours if applied in bright sunlight. Optimum activity is obtained when the product is applied early post-emergence (2-4 leaf stage in weeds). Flumiclorac-pentyl is rainfast one hour after application. The short soil half-life means it poses no risk to rotation crops.

In field trials, flumiclorac-pentyl gave similar control to fomesafen, but at very much lower application rates. The yield of soybeans was also similar to fomesafen-treated crops.

Maize and soybean show good tolerance to flumiclorac as does the weed Brassica kaber. The tolerance of Brassica to this herbicide is attributed to enhanced herbicide metabolism compared to susceptible species. Increased metabolism plus decreased herbicide retention, absorbtion and translocation explain the selectivity in maize whereas the tolerance of soybean is due to decreased herbicide retention and increased herbicide metabolism (Weed Science, 2000).
CropUse
CropUses:
Soybeans, maize

 

30-90 g ai/ha

Physical Properties
Molecular weight:423.9; Physical form:Beige solid, with a halide odour. Density:1.33 g/ml (20 °C); Melting point:88.9-90.1 °C; Flash point:68 °C; Vapour pressure:<0.01 mPa (22.4 °C); Partition coefficient(n-octanol and water):logP = 4.99 (20 °C); Solubility:In water 0.189 mg/l (25 °C). In methanol 47.8, hexane 3.28, n-octanol 16.0, acetone 590 (all in g/l).; Stability:Hydrolytic DT50 4.2 d ( pH 5), 19 h ( pH 7), 6 min ( pH 9). Aqueous photolysis DT50 are similar.
Toxicology
Oral:Acute oral LD50 for rats 3.69 kg 0.86EC/ kg. Percutaneous:Acute percutaneous LD50 for rabbits >2.0 g 0.86EC/kg. Moderately irritating to skin and eyes; not a skin sensitiser. Inhalation: LC50 for rats 5.51 mg 0.86EC/l.
Environmental Profile
Ecotoxicology: 
Bees: LD50 (contact) >196 μg/bee.Birds:Acute oral LD50 for bobwhite quail >2250 mg/kg. Dietary LC50 for bobwhite quail and mallard ducks >5620 ppm.Daphnia: LC50 (48 h) >38.0 mg/l.Fish: LC50 for rainbow trout 1.1, bluegill sunfish 13-21 mg/l. 

Environmental fate: 
Soil:Rapidly degraded in soil: DT50 0.48-4.4 d in loamy-sand soil ( pH 7); degradates have DT50 c. 2-30 d. The a.i. is immobile in soil; degradates have low to mediumPlant:In soya beans and maize, the major metabolite is 2-chloro-4-fluoro-5-(4-hydroxy-1,2-cyclohexanedicarboximido)phenoxyacetic acid formed by reduction of the tetrahydrophthaloyl double bond and hydroxylation; other metabolic pathways include cleavage of the
Transport Information
Signal Word:WARNING; Hazard Class:II(Moderately hazardous)

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