Chemical Identification
Common Name
Mefenacet
中文通用名
苯噻酰草胺
IUPAC
2-(1,3-benzothiazol-2-yloxy)-N-methylacetanilide
or
2-benzothiazol-2-yloxy-N-methylacetanilide
CAS
2-(2-benzothiazolyloxy)-N-methyl-N-phenylacetamide
CAS No.
73250-68-7
Molecular Formula
C16H14N2O2S
Molecular Structure
Category
Activity
Herbicide
Premix
Pyrazosulfuron-ethyl+mefenacet
Pyrazosulfuron-ethyl+mefenacet+alachlor
Bensulfuron-methyl+daimuron+mefenacet
Bensulfuron-methyl+mefenacet
Bensulfuron-methyl+mefenacet+thiobencarb
Bensulfuron-methyl+mefenacet+alachlor
Bensulfuron-methyl+mefenacet+acetochlor
Mefenacet+Bensulfuron-methyl+Mesotrione
Mefenacet+Halosulfuron-methyl+Mesotrione
Mefenacet+Bensulfuron-methyl+Anilofos
Granules, wettable powder. Premix Parters: iodosulfuron-methyl-sodium; propoxycarbazone-sodium;
Physical Properties
Molecular weight:298.4; Physical form:Colourless, odourless crystals. Melting point:134.8 °C; Vapour pressure:6.4 × 10-4 mPa (20 °C); 11 mPa (100 °C); Partition coefficient(n-octanol and water):logP = 3.23; Solubility:In water 4 mg/l (20 °C). In dichloromethane >200, hexane 0.1-1.0, toluene 20-50, isopropanol 5-10 (all in g/l, 20 °C).; Stability:Stable to light. In storage, 94.8% remains unchanged after 6 months at 30 °C. Stable to hydrolysis at pH 4-9.;
Toxicology
Oral:Acute oral LD50 for rats, mice and dogs >5000 mg/kg. Percutaneous:Acute percutaneous LD50 for rats and mice >5000 mg/kg. Not irritating to skin and eyes (rabbits). Inhalation: LC50 (4 h) for rats >0.02 mg/l (dust).
Environmental Profile
Ecotoxicology: 
Algae: EC50 (96 h) for Scenedesmus subspicatus 0.18 mg/l.Birds: LC50 (5 d) for bobwhite quail >5000 mg/ kg diet.Daphnia: LC50 (48 h) 1.81 mg/l.Fish: LC50 (96 h) for carp 6.0, trout 6.8, golden orfe 11.5 mg/l.Worms: LC50 (28 d) for Eisenia foetida >1000 mg/ kg dry substrate. 

Environmental fate: 
Animals:Degradation in the rat is to N-methylaniline which is subsequently demethylated, acetylated and hydroxylated to 4-aminophenol and its sulfate and glucuronide conjugates.Soil:In soil, mefenacet is strongly adsorbed and therefore shows little movement. DT50 in soil is a few weeks; metabolites formed are benzothiazole and benzothiazolyloxyacetic acid. In sterile aqueous buffer solutions, mefenacet undePlant:Metabolised to 4-aminophenol via oxidation of an intermediate N-methylaniline. Other metabolites found are benzothiazolone and benzothiazolyloxyacetic acid; both are degraded by hydroxylation.
Transport Information
Signal Word:CAUTION; Hazard Class:III(Slightly hazardous)

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