Cypermethrin

TC & FORMULATION: 94%TC, 25%EC, 10%EC, 5%EC

Structure Formula:  

NOMENCLATURE

Common name cypermethrin (BSI, E-ISO, ANSI, BAN); cyperméthrine ((f) F-ISO)

IUPAC name (RS)-a-cyano-3-phenoxybenzyl (1RS,3RS;1RS,3SR)-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate

Roth: (RS)-a-cyano-3-phenoxybenzyl (1RS)-cis-trans-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate 

Chemical Abstracts name cyano(3-phenoxyphenyl)methyl 3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropanecarboxylate 

CAS RN [52315-07-8] (formerly [69865-47-0], [86752-99-0] and many other numbers) 

PHYSICAL CHEMISTRY

Composition Tech. grade is 90% pure.  Mol. wt. 416.3  M.f. C22H19Cl2NO3  Form Odourless crystals; (tech., yellow-brown viscous semi-solid at ambient temperatures).  M.p. 61-83 °C, depending on isomer ratio  V.p. 2.0 ´ 10-4 mPa (20 ºC)  KOW logP = 6.6  Henry 2.0 ´ 10-2 Pa m3 mol-1 (calc.)  S.g./density 1.24 (20 ºC)  Solubility In water 0.004 mg/l (pH 7). In acetone, chloroform, cyclohexanone, xylene >450, ethanol 337, hexane 103 (all in g/l, 20 ºC).  Stability Relatively stable in neutral and weakly acidic media, with optimum stability at pH 4. Hydrolysed in alkaline media; DT50 1.8 d (pH 9, 25 °C); stable at pH 5 and 7 (20 °C). Relatively stable to light in field situations. Thermally stable up to 220 ºC.  F.p. Not auto-flammable; non-explosive 

APPLICATIONS

Biochemistry Acts on the nervous system of the insect, disturbs the function of neurons by interaction with the sodium channel.  Mode of action Non-systemic insecticide with contact and stomach action. Also exhibits anti-feeding action. Good residual activity on treated plants.  Uses Control of a wide range of insects, especially Lepidoptera, but also Coleoptera, Diptera, Hemiptera, and other classes, in fruit (including citrus), vines, vegetables, potatoes, cucurbits, lettuce, capsicums, tomatoes, cereals, maize, soya beans, cotton, coffee, cocoa, rice, pecans, oilseed rape, beet, ornamentals, forestry, etc. Control of flies and other insects in animal houses; and mosquitoes, cockroaches, houseflies and other insect pests in public health. Also used as an animal ectoparasiticide. Formulation types EC; GR; UL; WP.  Compatibility Incompatible with alkaline materials.

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