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Common name methomyl (BSI, E-ISO, (m) F-ISO, ANSI, ESA, JMAF)
IUPAC name S-methyl N-(methylcarbamoyloxy)thioacetimidate
Chemical Abstracts name methyl N-[[(methylamino)carbonyl]oxy]ethanimidothioate
CAS RN [16752-77-5]
PHYSICAL CHEMISTRY
Composition Methomyl is a mixture of (Z)- and (E)- isomers, the former predominating. Mol. wt. 162.2 M.f. C5H10N2O2S Form Colourless crystals, with a slight sulfurous odour. M.p. 78-79 ºC V.p. 0.72 mPa (25 °C) KOW logP = 0.093 Henry 2.13 ´ 10-6 Pa m3 mol-1 S.g./density 1.2946 (25 ºC) Solubility In water 57.9 g/l (25 ºC). In methanol 1000, acetone 730, ethanol 420, isopropanol 220, toluene 30 (all in g/kg, 25 ºC). Sparingly soluble in hydrocarbons. Stability Stable in water for 30 d (pH 5 and 7); DT50 c. 30 d (pH 9). Stable up to 140 ºC. Stable to sunlight when exposed for 120 d.
APPLICATIONS
Biochemistry Cholinesterase inhibitor.
Mode of action Systemic insecticide and acaricide with contact and stomach action.
Uses Control of a wide range of insects (particularly Lepidoptera, Hemiptera, Homoptera, Diptera and Coleoptera) and spider mites in fruit, vines, olives, hops, vegetables, ornamentals, field crops, cucurbits, flax, cotton, tobacco, soya beans, etc. Also used for control of flies in animal and poultry houses and dairies.
Phytotoxicity Non-phytotoxic when used as recommended, except to some varieties of apple.