Dimethoate

Common name dimethoate (BSI, E-ISO, (m) F-ISO, ANSI, ESA, JMAF); fosfamid (USSR)

IUPAC name O,O-dimethyl S-methylcarbamoylmethyl phosphorodithioate; 2-dimethoxyphosphinothioylthio-N-methylacetamide 

Chemical Abstracts name O,O-dimethyl S-[2-(methylamino)-2-oxoethyl] phosphorodithioate 

CAS RN [60-51-5] 

Composition Tech. grade is 95% pure. 

Mol. wt. 229.3 

M.f. C5H12NO3PS2 

Form Colourless crystals; (tech., white solid pellets). 

M.p. 50.0-51.5 癈 (purity 99.5%) 

B.p. 117 篊/0.1 mmHg 

V.p. 0.25 mPa (25 癈) 

KOW logP = 0.704 

Henry 1.42 ´ 10-6 Pa m3 mol-1 

S.g./density 1.31 (20 癈, 99.1% pure) 

Solubility In water 23.3 (pH 5), 23.3 (pH 7), 25.0 (pH 9) (all in g/l, 25 篊). Readily soluble in most organic solvents, e.g. in alcohols, ketones, benzene, toluene, chloroform, dichloromethane >300, carbon tetrachloride, saturated hydrocarbons, n-octanol >50 (all in g/kg, 20 篊). 

Mode of action Systemic insecticide and acaricide with contact and stomach action. 

Uses Control of a wide range of Acari, Aphididae, Aleyrodidae, Coccidae, Coleoptera, Collembola, Diptera, Lepidoptera, Pseudococcidae and Thysanoptera in cereals, citrus, coffee, cotton, fruit, grapes, olives, pastures, beetroot, potatoes, pulses, tea, tobacco, ornamentals, ornamental shrubs, and vegetables.