Chemical Identification
Common Name
Alpha-cypermethrin
中文通用名
顺式氯氰菊酯
IUPAC
racemate comprising (R)-α-cyano-3-phenoxybenzyl (1S,3S)-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate and (S)-α-cyano-3-phenoxybenzyl (1R,3R)-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate
or
racemate comprising (R)-α-cyano-3-phenoxybenzyl (1S)-cis-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate and (S)-α-cyano-3-phenoxybenzyl (1R)-cis-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate
CAS
(R)-cyano(3-phenoxyphenyl)methyl (1S,3S)-rel-3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropanecarboxylate
CAS No.
67375-30-8
Molecular Formula
C22H19Cl2NO3
Molecular Structure
Category
Activity
Insecticide
Premix
Alpha-cypermethrin+chlorpyrifos
Hexaflumuron+alpha-cypermethrin
acetamiprid+alpha-cypermethrin
Abamectin+Alpha-cypermethrin
Alpha-cypermethrin+Indoxacarb
Emulsifiable concentrate, flowable, ULV (concentration varies by country). Other formulations may be developed for specific local use. Premix Parters: bifenthrin; carbosulfan; carbosulfan imidacloprid.
Physical Properties
Molecular weight:416.3. Physical form:Colourless crystals; (tech. is a white to pale powder, with a weak aromatic odour). Density:1.28 (22 ℃); Composition:Tech. grade alpha-cypermethrin is >90% pure m/m, typically >95%. Melting point:78-81 ℃; Flash point:>80 ℃ (closed cup); Vapour pressure:2.3 × 10-2 mPa(20℃); Henry constant:6.9 × 10-2 Pa m3 mol-1 (calc.); Partition coefficient(n-octanol and water):logP = 6.94 ( pH 7); Solubility:In water c. 0.01 mg/l (25 ℃). In acetone 620, dichloromethane 550, cyclohexanone 515, ethyl acetate 440, chlorobenzene 420, acetophenone 390, o-xylene 350, hexane 7 (all in g/l, 25 ℃). In maize oil 19-20, ethylene glyc; Stability:Very stable in neutral and acidic media. Hydrolysed in strongly alkaline media. Thermally stable up to 220 ℃. Field data indicate that, in practice, it is stable to air and light.Soluble in chloroform, methylene chloride, toluene, xylene, acetone. Slightly soluble in petroleum ether, hexane, methanol.
Toxicology
Oral:Acute oral LD50 for rats 79-400 mg/kg(in corn oil, value depending on concentration), 474 mg/kg. Percutaneous:Acute percutaneous LD50 for rats and rabbits >2000 mg/kg; minimal irritant to the eyes of rabbits. Inhalation:LC50 (4 h) for rats 0.32 mg/l air. ADI:(JECFA evaluation) 0.05 mg/kg b.w.[1996]; (JMPR) 0.05 mg/kg b.w. [1981].?
(Rabbit): Dermal LD50 >2000 mg/kg. Fastac*: (Rat): Oral LD50 64-5000 mg/kg
Environmental Profile

Ecotoxicology:?
Bees:Toxic to bees. LD50 (24 h) 0.059 mg/bee. No toxic effect under field conditions.Birds:LD50 for quail and mallard ducks >10 000 mg/kg.Daphnia: LC50 (48 h) 0.1-0.3 mg/l.Fish: LC50 (96 h) for rainbow trout 0.0028 mg/l; due to rapid loss from water, no toxic effect to fish is observed under field conditions.Worms: LD50(14 d) for earthworms >100 mg/kg artificial soil.?
Environmental fate:?
EHC 142 notes that, although highly toxic to fish, this is not realised under field conditions where rapid loss from water allows recovery of affected populations.Animals: See cypermethrin.Soil:Undergoes degradation in soil, DT50 c. 13 w in loamy soil.WATER SOLUBILITY: <1 ppm at 25

Transport Information
Hazard Class:II (Moderately hazardous)

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