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Chemical Identification
Common Name
Imazethapyr
中文通用名
咪草烟
IUPAC
5-ethyl-2-[(RS)-4-isopropyl-4-methyl-5-oxo-2-imidazolin-2-yl]nicotinic acid
CAS
2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acid
CAS No.
81335-77-5
Molecular Formula
C15H19N3O3
Molecular Structure
Category
Activity
Herbicide
Premix
Imazethapyr+saflufenacil
imazamox+imazethapyr+sethoxydim
imazamox+imazethapyr
Imazameth+Imazethapyr
Fomesafen+imazethapyr
Chlorimuron-ethyl+imazethapyr-ammonium
Aqueous concentrate. 
Premix Parters: 6-benzylaminopurine (BAP) gibberellic acid zeatin
Physical Properties
Molecular weight:289.3; Physical form:Colourless crystals. Density:1.10-1.12 (21 °C); Melting point:169-173 °C; Vapour pressure:<0.013 mPa (60 °C); Partition coefficient(n-octanol and water):logP = 1.04 ( pH 5), 1.49 ( pH 7), 1.20 ( pH 9) (all 25 °C); pKa: pKa1 2.1, pKa2 3.9; Solubility:In water 1.4 g/l (25 °C). In acetone 48.2, methanol 105, toluene 5, dichloromethane 185, dimethyl sulfoxide 422, isopropanol 17, heptane 0.9 (all in g/l, 25 °C).; Stability:Rapidly degraded in sunlight, DT50 c. 3 d.
Toxicology
Oral:Acute oral LD50 for male and female rats, and female mice >5000 mg/ kg. Percutaneous:Acute percutaneous LD50 for rabbits >2000 mg/ kg; mild skin and reversible eye irritant. Inhalation: LC50 for rats 3.27 mg/l air (analytical), 4.21 mg/l (gravimetric). Phytotoxicity:Non-phytotoxic to soya beans and other leguminous crops, when used as directed.
Environmental Profile
Ecotoxicology: 
Algae: NOEL for Selenastrum capricornutum 50 mg/l.Bees:Topical LD50 for honeybees >0.1 mg/bee.Birds:Acute oral LD50 for bobwhite quail and mallard ducks >2150 mg/ kg.Daphnia: LC50 (48 h) <1000 mg/l.Fish: LC50 (96 h) for bluegill sunfish 420, rainbow trout 340, channel catfish 240 mg/l.Worms:I50 >10 000 mg/ kg.Other aquatic spp.:I50 for Lemna gibba 4.38 μg/l. 

Environmental fate: 
Animals:In rats, following oral administration, 92% was excreted in the urine and 5% in the faeces within 24 hours. Residue levels in blood, liver, kidney, muscle, and fat tissues were <0.01 ppm after 48 hours.Soil:Half-life in soil 1-3 months.Plant:Rapidly metabolised in non-susceptible plants; half-life in soya beans 1.6 days. The primary metabolic route in maize is oxidative hydroxylation at the a-carbon atom of the ethyl substituent on the pyridine ring.
Transport Information
Signal Word:CAUTION; Hazard Class:III(Slightly hazardous)

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