Cyper-25 Insecticide

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NOMENCLATURE
Common name cypermethrin (BSI, E-ISO, ANSI, BAN); cypermACthrine ((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) Development codes NRDC 149; PP383 (ICI); WL 43 467 (Shell); LE 79-600 (RhA'ne-Poulenc); FMC 30980 Official codes OMS 2002

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 A C, depending on isomer ratio V.p. 2.0 A' 10-4 mPa (20 A C) KOW logP = 6.6 Henry 2.0 A' 10-2 Pa m3 mol-1 (calc.) S.g./density 1.24 (20 A C) Solubility In water 0.004 mg/l (pH 7). In acetone, chloroform, cyclohexanone, xylene >450, ethanol 337, hexane 103 (all in g/l, 20 A C). 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 A C); stable at pH 5 and 7 (20 A C).