Metosulam

Favorites

Chemical Identification | General Product Information | Physical & Safety Data

Chemical Identification

Common Name

Metosulam

中文通用名

磺草唑胺

IUPAC

2',6'-dichloro-5,7-dimethoxy-3'-methyl[1,2,4]triazolo[1,5-a]pyrimidine-2-sulfonanilide

CAS

N-(2,6-dichloro-3-methylphenyl)-5,7-dimethoxy[1,2,4]triazolo[1,5-a]pyrimidine-2-sulfonamide

CAS No.

[139528-85-1]

Molecular Formula

C₁₄H₁₃Cl₂N₅O₄S

Molecular Structure

General Product Information

Category

Herbicides > Triazolopyrimidine herbicides
Herbicides > Anilide herbicides
Herbicides > Amide herbicides

Activity

Herbicide.Metosulam can be applied pre- and early post-emergence (between two and four true leaves) in maize and post-emergence in winter small-grain cereals. It controls atrazine-resistant weeds. Adjuvants improve activity in maize, but make no difference in small grains. Metosulam acts slightly slower at low temperatures.

In field trials, metosulam has shown good selectivity to target crops and rotational crops.

CropUse

CropUses:
cereals, maize, rice, lupins

10-15 g ai/ha

Maize: 25 g ai/ha

Premix

Type	AI concⁿ
Suspension concentrate (SC)	10% (w/v)
Water-dispersible granule (WG)	71.4% (w/w)

Physical & Safety Data

Physical Properties

Molecular weight:418.3; Physical form:Cream to tan coloured powder. Density:1.49 (20 °C); Melting point:210-211.5 °C; Vapour pressure:4 × 10-10 (20 °C, Knudsen effusion); Partition coefficient(n-octanol and water):logP = 0.9778 (distilled water), 2.12 ( 5), 2.46 ( 7), 3.08 ( 9) (all at 20 °C); pKa:4.8; Solubility:In water 200 (distilled water, 7.5), 100 ( 5.0), 700 ( 7.0), 5600 ( 9.0) (all in /l, 20 °C). In acetone, acetonitrile and dichloromethane >5.0 g/l; in n Little photolytic instability (50 140 d - Xenon Arc); stable to hydrolysis across environmentally normal range.;

Toxicology

Oral:Acute oral LD₅₀for rats and mice >5000 /. Percutaneous:Acute percutaneous LD₅₀for rabbits >2000 /kg. Not a skin sensitiser (guinea pigs). Inhalation:

Environmental Profile

Mallard duck	LD₅₀ >2,000 mg/kg Bobwhite quail LD₅₀ >2,250 mg/kg
Rainbow trout _{[96 hrs]}	LC₅₀ >100mg/litre Bluegill _{[96 hrs]} LC₅₀ >170μg/litre

Fate in :
The LC₅₀ values for Rainbow trout and Bluegill represent the solubility limit.

Fate in soil:
Metosulam is degraded by microbes; the half-life in soil is less than 11 days (dependent on soil type). It has limited mobility in all soil types.

Fate in aquatic systems:
Metosulam is degraded photochemically (half-life 140 days) and by hydrolysis (half-life >30 days) in water.

Transport Information

Hazard Class:III(Slightly hazardous)