Mecoprop

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Chemical Identification | General Product Information | Physical & Safety Data

Chemical Identification

Common Name

Mecoprop

中文通用名

2-甲-4-氯苯氧丙酸

IUPAC

(RS)-2-(4-chloro-o-tolyloxy)propionic acid

CAS

2-(4-chloro-2-methylphenoxy)propanoic acid

CAS No.

7085-19-0

Molecular Formula

C₁₀H₁₁ClO₃

Molecular Structure

General Product Information

Category

Herbicides > Phenoxy herbicides

Activity

Herbicide

Premix

MCPA+dichlorprop-P+mecoprop-P
Soluble concentrates of salts, emulsifiable concentrates of esters, aqueous solution. Premix Parters: bensulfuron-methyl; bensulfuron-methyl thiobencarb; bromobutide naproanilide; bromobutide pyrazolynate; MCPB simetryn; pyrazosulfuron-ethyl;

Physical & Safety Data

Physical Properties

Molecular weight:214.6; Physical form:Colourless crystals. Melting point:93°-94°C; Vapour pressure:0.31 mPa (20 °C); Henry constant:1 × 10-4 Pa m3 mol-1 (calc.); Partition coefficient(n-octanol and water):logP = 0.1004 ( pH 7), 3.2 (unionised, 25 °C, K. Chamberlain et al., Pestic. Sci., 47, 265 (1996)); pKa:3.78 (but see mecoprop-P); Solubility:In water 734 mg/l (25 °C). In acetone, diethyl ether, ethanol >1000, ethyl acetate 825, chloroform 339 (all in g/ kg, 20 °C). Salts in water: potassium 920, sodium 500, diethanolamine 580, dimethylamine 660 (all in g/l, 20; Stability:Stable to heat, and to hydrolysis, reduction, and atmospheric oxidation. Mecoprop is acidic, and forms salts, many of which are water-soluble.;

Toxicology

Oral:Acute oral LD₅₀ for rats 930-1166, mice 650 mg/ kg. Percutaneous:Acute percutaneous LD₅₀ for rabbits 900, rats >4000 mg/kg. Skin irritant; highly irritating to eyes. Inhalation: LC₅₀ (4 h) for rats >12.5 mg/l air. ADI:( JMPR) 0.002 mg/ kg b.w. [1986].

Environmental Profile

Ecotoxicology: Bees:Not toxic to honeybees. LD₅₀ (oral) >10 mg/bee; (contact) >100 mg/bee.Birds:Acute oral LD₅₀ for Japanese quail 740, mallard ducks >486 mg/kg. Dietary LD₅₀ for bobwhite quail >5000, mallard ducks >5620 ppm.Daphnia: LC₅₀ (48 h) 420 mg/l; NOEC (reproduction) 22.7 mg/l.Fish: LC₅₀ (96 h) for trout 150-240, bluegill sunfish >100, carp 320-560 mg/l. Environmental fate: Animals:In mammals, following oral administration, mecoprop is predominantly eliminated unchanged in the urine as conjugates.Soil:In soil, degraded predominantly by micro-organisms to 4-chloro-2-methylphenol, followed by ring hydroxylation at the 6-position and ring opening. DT₅₀ in soil 7-13 d. Duration of residual activity in soil is c. 2 mo.

Transport Information

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