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Common name thiodicarb (BSI, draft E-ISO, (m) draft F-ISO, ANSI)
IUPAC name 3,7,9,13-tetramethyl-5,11-dioxa-2,8,14-trithia-4,7,9,12-tetra-azapentadeca-3,12-diene-6,10-dione
Chemical Abstracts name dimethyl N,N'-[thiobis[(methylimino)carbonyloxy]]bis(ethanimidothioate)
CAS RN [59669-26-0]
PHYSICAL CHEMISTRY
Composition Tech. grade is 96% pure. Mol. wt. 354.5 M.f. C10H18N4O4S3 Form Colourless crystals; (tech., pale tan crystals). M.p. 173-174 ºC V.p. 5.7 mPa (20 ºC) KOW logP = 1.62 Henry 4.31 ´ 10-2 Pa m3 mol-1 (calc.) S.g./density 1.44 g/ml (20 ºC) Solubility In water 35 mg/l (25 ºC). In dichloromethane 150, acetone 8, methanol 5, xylene 3 (all in g/kg, 25 ºC). Stability Stable at pH 6, rapidly hydrolysed at pH 9 and slowly at pH 3 (DT50 c. 9 d). Aqueous suspensions are decomposed by sunlight. Stable up to 60 ºC.
APPLICATIONS
Biochemistry Cholinesterase inhibitor.
Mode of action Insecticide with predominantly stomach action, but also limited contact action. As a seed treatment, rapidly translocated systemically through the plant. Molluscicide which provokes paralysis and death.
Uses Control of all stages of major Lepidoptera and Coleoptera pests and some Hemiptera and Diptera on cotton, soya beans, maize, vines, fruit, vegetables, and many other crops, at 200-1000 g/ha; seed treatment rates are 2500-10 000 g/tonne. Also used as a molluscicide for control of slugs in cereals and oilseed rape.