Butroxydim

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Chemical Identification | General Product Information | Physical & Safety Data

Chemical Identification

Common Name

Butroxydim

中文通用名

丁苯草酮

IUPAC

(5RS)-5-(3-butyryl-2,4,6-trimethylphenyl)-2-[(EZ)-1-(ethoxyimino)propyl]-3-hydroxycyclohex-2-en-1-one

CAS

2-[1-(ethoxyimino)propyl]-3-hydroxy-5-[2,4,6-trimethyl-3-(1-oxobutyl)phenyl]-2-cyclohexen-1-one

CAS No.

138164-12-2

Molecular Formula

C₂₄H₃₃NO₄

Molecular Structure

General Product Information

Category

Herbicides > Cyclohexene oxime herbicides

Activity

Herbicide
Butroxydim is absorbed by foliage and is most active when applied to young weeds. The use of adjuvants is recommended to optimise activity. Butroxydim has the potential to damage cereal crops, but no problems have been encountered with cereals grown in rotation with target crops.

CropUse

CropUses:
cotton, soybeans, peanuts, legumes, sunflowers

Application rates vary from 25-75 g ai/ha depending on the target weed, growth stage and environmental conditions.

Premix

Type	AI concⁿ
Water-dispersible granules (WG)	25% (w/w)

Physical & Safety Data

Physical Properties

Molecular weight:399.5; Physical form:Off-white powdery solid. Density:1.20 ( tech., 25 °C); Melting point:80.8 °C; Vapour pressure:1 × 10-3 mPa (20 °C); Henry constant:5.79 × 10-5 Pa m3 mol-1 ( calc.); Partition coefficient(n-octanol and water):logP = 1.90 ( pH 7, 25 °C); pKa:4.36 (23 °C), weak acid; Solubility:In water 6.9 mg/l (20 °C). In dichloromethane >500, acetone 450, toluene 480, acetonitrile 380, methanol 90, hexane 30 (all in g/l).; Stability:Hydrolysis DT50 10.5 d ( pH 5), >240 d ( pH 7), stable ( pH 9) (all 25 °C).;

Toxicology

Oral: LD₅₀ for male rats 3476, female rats 1635 mg/kg. Percutaneous:Acute percutaneous LD₅₀ for rats >2000 mg/kg. Moderate skin irritant; mild eye irritant (rabbits). Not a skin sensitiser (guinea pigs). Inhalation: LC₅₀ (4 h) for rats >2.99 mg/l. ADI:0.5 mg/kg (provisional).

Environmental Profile

Ecotoxicology:
Algae: E_bC₅₀ for Selenastrum capricornutum 0.71 mg/l.Bees: LD₅₀ (contact, 24 h) >200 mg/bee.Birds:Acute oral LD₅₀ for mallard ducks >2000, bobwhite quail 1221 mg/kg. Sub-acute dietary LC₅₀ (5 d) for mallard ducks >5200, bobwhite quail 5200 mg/kg.Daphnia: LC₅₀ (48 h) >3.7 mg/l.Fish: LC₅₀ (96 h) for rainbow trout >6.9, bluegill sunfish 8.8 mg/l.Worms: LC₅₀ (14 d) for Eisenia foetida >1000 mg/kg.

Environmental fate:
Animals:In rats, following oral administration, >90% of the dose is excreted within 7 d. Various oxidative transformations of the butyryl chain dominate the metabolic pathway. Neither parent nor metabolites bioaccumulate in tissues.Soil:Soil K_oc 6-1270 (stronger adsorption in low pH soils). Rapid degradation in aerobic soil, lab. DT₅₀ c. 9 d (20 °C, 40% MHC, pH 7.0, 4.09%