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Common name beta-cypermethrin
IUPAC name Roth: A reaction mixture comprising two enantiomeric pairs in ratio c. 2:3 (S)-a-cyano-3-phenoxybenzyl (1R)-cis-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate
CAS RN [52315-07-8]
Mol. wt. 416.3
M.f. C22H19Cl2NO3
Form Tech. forms colourless or pale yellow crystals.
M.p. 64-71 ºC (peak 67 °C), (varies with even small - 1% - change in isomer ratio)
V.p. 1.8 10-4 mPa (20 ºC)
KOW logP >4.7 (pH 7)
S.g./density 1.32 g/ml (theoretical), 0.66 g/ml (crystal powder) (20 ºC)
Solubility In water 51.5 (5 ºC), 93.4 (25 ºC), 276.0 (35 ºC) (all in mg/l, pH 7). In isopropanol 11.5, xylene 349.8, dichloromethane 3878, acetone 2102, ethyl acetate 1427, petroleum ether 13.1 (all in mg/ml, 20 ºC).
Applications:Can be used against a wide range of insect pests in public health (e.g. flies, cockroaches, mosquitoes, fleas, lice, bugs) and in veterinary applications (ectoparasitic ticks and mites). In plant protection, it is effective against Coleoptera and Lepidoptera, and gives good protection against Orthoptera, Diptera, Hemiptera, and Homoptera. Mainly used in alfalfa, cereals, cotton, grapes, maize, oilseed rape, pome fruit, potatoes, soya beans, sugar beet, tobacco and vegetables.
beta-Cypermethrin 95%TC
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ITEM OF TEST
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SPECIFICATION
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RESULT
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APPEARANCE
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off-white powder
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off-white powder
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CONTENT
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95.0% MIN
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95.2%
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WATER
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0.2% MAX
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0.1%
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ACIDITY
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0.2% MAX
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0.08%
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Toxicology
Oral:Acute oral for female rats 166. Male rats 178, female mice 48, male mice 43
Percutaneous: acute percutaneous 50 for rats＞5000
Mild skin and eye irritant(rabbits) non-sensitising to skin(guinea pigs)
Inhalation:50(4h) for rats＞1.97
ADI:0.02
Ecotoxicology:
Algae: 50 for selenastrum capicornutum 56.2/l
Bees:50(oral, 48h)0.0018/bee(as 5% formulation) (contact, 24h) 0.085/ (as 5% formulation); but not harmful at normal rate underfieldconditions.
Birds:acute oral 50 for quail 8030, pheasants 3515 5% formulation/kg 50(8d) for pheasants and quail＞5000 5% formulation
Daphnia: 50(96h)0.00026 5% formulation
Fish:50(96h) for carp 0.028, catfish 0.015, grass carp 0.035 5% formulation
Fish are not harmed under normal field conditions.
Environmental fate:
Soil:50 10d(lime-furred chermozom, 6.96) 50 on water 1.2d
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