Oxasulfuron

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Chemical Identification | General Product Information | Physical & Safety Data

Chemical Identification

Common Name

Oxasulfuron

中文通用名

环氧嘧磺隆

IUPAC

oxetan-3-yl 2-[(4,6-dimethylpyrimidin-2-yl)carbamoylsulfamoyl]benzoate

CAS

3-oxetanyl 2-[[[[(4,6-dimethyl-2-pyrimidinyl)amino]carbonyl]amino]sulfonyl]benzoate

CAS No.

144651-06-9

Molecular Formula

C₁₇H₁₈N₄O₆S

Molecular Structure

General Product Information

Category

Herbicides > Sulfonylurea Herbicides

Activity

Herbicide.Oxasulfuron is a short-residual herbicide that has to be applied post-emergence of the crops. It is taken up by the roots and shoots and translocated to the meristematic tissue. Treated weeds die 1-3 weeks after application. Optimum weed control is obtained in damp conditions. Weeds that are not killed are severely stunted and do not compete with the soybean crop. Oxasulfuron is rainfast within four hours of application. A surfactant, such as X-77, should be tank-mixed with the herbicide for optimum activity. Oxasulfuron is safe to rotational crops. Novartis recommends its use in an integrated soybean weed control programme with other pre- and post-emergence products. The product can be tank-mixed with other post-emergence soybean herbicides (including acifluorfen, lactofen and bentazone) although not post-emergence graminicides.

CropUse

CropUses:
soybeans

Soybeans

45-80 g ai/ha

Physical & Safety Data

Physical Properties

Molecular weight:406.4g/mol; Physical form:White, odourless powder. Density:1.41; Melting point:158℃ ( decomp.); Vapour pressure:<2 × 10-3 mPa (25 ℃); Henry constant:<3.2 × 10-5 Pa m3 mol-1 (calc.); Partition coefficient(n-octanol and water):logP = 0.75 ( pH 5), -0.81 ( pH 7), -2.2 ( pH 8.9); pKa:5.1; Solubility:In water 52 ppm ( pH 5.1, 25℃); in buffer, 63 ( pH 5.0), 1700 ( pH 6.8), 19 000 ( pH 7.8) mg/l (15℃). In methanol 1500, acetone 9300, toluene 320.

Toxicology

Oral:Acute oral LD₅₀ for rats >5000 mg/ kg. Percutaneous:Acute percutaneous LD₅₀ for rabbits >2000 mg/kg. No skin or eye irritation (rabbits). Not a skin sensitiser (guinea pigs). Inhalation: LC₅₀ for rats >5.08 mg/l air. ADI:( JMPR) 0.03 mg/ kg b.w. [1985].

Environmental Profile

WATER SOLUBILITY: 280 g/l at 25℃ HAZARDS: Fish: LC₅₀ >111 mg/l (bluegill sunfish); >116 mg/l (trout). Bird: Oral LD₅₀ >2250 mg/kg (mallard duck, quail). Bee: Nontoxic. LD₅₀ >25 μg/bee

Bobwhite quail	LD₅₀ >2,250 mg/kg
Mallard duck	LD₅₀ >2,250 mg/kg
Bluegill sunfish _{[96 hrs]}	LC₅₀ >111 mg/litre
Rainbow trout _{[96 hrs]}	LC₅₀ >116 mg/litre
Bee	LD₅₀ >25 μg/bee

Fate in soil:
The half-life of oxasulfuron in soil is less than two weeks. It is degraded microbially and chemically. The rate of degradation is independent of soil conditions.

Fate in aquatic systems:
The half-life of oxasulfuron in aquatic systems is approximately 12 days. Its solubility increases with increasing pH.

Transport Information

Signal Word:CAUTION; Hazard Class:III(Slightly hazardous)