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NOMENCLATURE
Common name alpha-cypermethrin (BSI, draft E-ISO); alpha-cypermACthrine ((f) draft F-ISO)
IUPAC name A racemate comprising (S)-a-cyano-3-phenoxybenzyl (1R,3R)-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate and (R)-a-cyano-3-phenoxybenzyl (1S,3S)-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate
Roth: A racemate comprising (S)-a-cyano-3-phenoxybenzyl (1R)-cis-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate and (R)-a-cyano-3-phenoxybenzyl (1S)-cis-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate
Chemical Abstracts name [1a(S*),3a]-(A )-cyano(3-phenoxyphenyl)methyl 3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropanecarboxylate
Other names alfoxylate*; alphamethrin* (rejected common name proposals) CAS RN [67375-30-8] correct stereochemistry; [52315-07-8] (formerly [86752-99-0], [86753-92-6]) cypermethrin (no stereochemistry stated) were sometimes used in Chemical Abstracts Development codes WL 85871 (Shell); FMC 63318; FMC 39391 Official codes OMS 3004

PHYSICAL CHEMISTRY
Composition Tech. grade alpha-cypermethrin is >90% pure m/m, typically >95%. Mol. wt. 416.3 M.f. C22H19Cl2NO3 Form Colourless crystals; (tech. is a white to pale powder, with a weak aromatic odour). M.p. 78-81 A C B.p. 200 A C/9.3 Pa V.p. 2.3 A' 10-2 mPa (20 A C) KOW logP = 6.94 (pH 7) Henry 6.9 A' 10-2 Pa m3 mol-1 (calc.)