pyrimidifen
Acaricide, insecticide
NOMENCLATURE
Common name pyrimidifen (BSI, pa E-ISO)
IUPAC name 5-chloro-N-{2-[4-(2-ethoxyethyl)-2,3-dimethylphenoxy]ethyl}-6-ethylpyrimidin-4-amine
Chemical Abstracts name 5-chloro-N-[2-[4-(2-ethoxyethyl)-2,3-dimethylphenoxy]ethyl]-6-ethyl-4-pyrimidinamine
CAS RN [105779-78-0] Development codes E-787 (Sankyo; Ube); SU-8801; SU-9118 (Sankyo)
PHYSICAL CHEMISTRY
Mol. wt. 377.9 M.f. C20H28ClN3O2 Form Colourless crystals. M.p. 69.4-70.9 °C V.p. 1.6 ´ 10-4 mPa (25 °C) KOW logP = 4.59 (23? °C) Henry 2.09 ´ 10-10 Pa m3 mol-1 (calc.) S.g./density 1.22 (20 °C) Solubility In water 2.17 mg/l (25 °C). Stability Stable in acid and alkali.
COMMERCIALISATION
History Developed jointly by Sankyo Co., Ltd and Ube Industries. Introduced in 1995. Patents US 4845097; EP 196524 Manufacturers Ube
APPLICATIONS
Uses Control of all stages of spider mites on apples, pears, vegetables, and tea; spider mites and rust mites on citrus fruit; and diamond-back moth on vegetables. Formulation types SC; WP. Selected products: 'Miteclean' (Sankyo Agro, Ube)
MAMMALIAN TOXICOLOGY
Oral Acute oral LD50 for male rats 148, female rats 115, male mice 245, female mice 229 mg/kg. Skin and eye Acute percutaneous LD50 for male and female rats >2000 mg/kg.
ECOTOXICOLOGY
Birds LD50 for mallard ducks 445 mg/kg; LC50 for mallard ducks >5200 ppm. Fish LC50 (48 h) for carp 0.093 ppm (SC). Bees LD50 (oral) 0.638 mg/bee; (contact) 0.660 mg/bee.
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