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Chemical Identification
Common Name
Pyriminobac-methyl
中文通用名
嘧草醚
IUPAC
methyl 2-(4,6-dimethoxy-2-pyrimidinyloxy)-6-(1-methoxyiminoethyl)benzoate
CAS
methyl 2-[(4,6-dimethoxypyrimidin-2-yl)oxy]-6-[1-(methoxyimino)ethyl]benzoate
CAS No.
136191-56-5'136191-64-5
Molecular Formula
C17H19N3O6
Molecular Structure
Category
Activity
Herbicide.Pyriminobac-methyl can safely be used from pre-emergence up to the three-leaf stage of Echinochloa spp in paddy rice. The product has residual activity, lasting up to seven weeks after treatment.
CropUse
CropUses:
Rice

 

30-90 g ai/ha

Premix
Pyrazosulfuron-ethyl+Pyriminobac-methyl+Pretilachlor
Pyrazosulfuron-ethyl+Pyriminobac-methyl
Bensulfuron-methyl+Pyriminobac-methyl
Physical Properties
Molecular weight:361.4; Physical form:White powder; ( tech., pale yellow grains). Density:(E)- isomer 1.3868; (Z)- isomer 1.2734 (both 20 °C); Composition:Tech. is >93%: (E)- isomer 75-78%, (Z)- isomer 20-11%. Melting point:Tech. 105 °C; pure (E)- isomer 107-109 °C; pure (Z)- isomer 70 °C; Vapour pressure:(E)- isomer 3.5 × 10-2 mPa (25 °C); (Z)- isomer 2.681 ×10-2 mPa (25 °C); Partition coefficient(n-octanol and water):(E)- isomer, logP = 2.98 (21.5 °C); (Z)- isomer, logP = 2.70 (20.6 °C); Solubility:(E)- isomer: in water 0.00925, methanol 14.6 (both in g/l, 20 °C). (Z)- isomer: in water 0.175, methanol 14.0 (both in g/l, 20 °C).; Stability:Stable in water (>1 y, pH 4-9), to light, and to heat (not decomposed after 14 d at 55 °C);
Toxicology
Oral:Acute oral 50 for rats >5000 /. Percutaneous:Acute percutaneous 50 for rats >2000 /kg. Slightly irritant to skin and eyes (rabbits). Inhalation:50 (4 h, 14 d observation) for rats >5.5 /l air.
Environmental Profile
Ecotoxicology: 
Bees: LD50 (24 h, oral and contact) >200µg/bee.Birds:Acute oral LD50 for bobwhite quail >2000 mg/kg. Dietary LC50 (5 d) for bobwhite quail and mallard ducks >5200 mg/ kg diet.Daphnia: LC50 (24 h) for D. carinata >20 mg/l.Fish: LC50 (96 h) for carp 30.9, rainbow trout 21.2 mg/l.Worms:NOEL (14 d) for Eisenia foetida >1000 mg/ kg soil. 

Environmental fate: 
Animals:Almost all of dosed 14C was excreted in urine and faeces. Many metabolites were detected.Soil: Koc ((E)- isomer) 972, ((Z)- isomer) 499.Plant:c. 10% of soil-applied 14C-pyriminobac-methyl (4-leaf stage, rice) was distributed throughout the plant; at harvest, residues were mostly in the straw. WATER SOLUBILITY: 34.8 mg/l at 20°C
Transport Information
Signal Word:CAUTION; Hazard Class:III(Slightly hazardous)

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