Chlorpyrifos

Common name chlorpyrifos (BSI, E-ISO, ANSI, ESA, BAN); chlorpyriphos ((m) F-ISO, JMAF); chlorpyriphos-閠hyl ((m) France)

IUPAC name O,O-diethyl O-3,5,6-trichloro-2-pyridyl phosphorothioate 

Chemical Abstracts name O,O-diethyl O-(3,5,6-trichloro-2-pyridinyl) phosphorothioate 

CAS RN [2921-88-2] 

Mol. wt. 350.6 

M.f. C9H11Cl3NO3PS 

Form Colourless crystals, with a mild mercaptan odour. 

M.p. 42-43.5 篊 

V.p. 2.7 mPa (25 篊) 

KOW logP = 4.7 

Henry 6.76 ´ 10-1 Pa m3 mol-1 (calc.) 

S.g./density 1.44 (20 癈) 

Solubility In water c. 1.4 mg/l (25 篊). In benzene 7900, acetone 6500, chloroform 6300, carbon disulfide 5900, diethyl ether 5100, xylene 5000, iso-octanol 790, methanol 450 (all in g/kg, 25 篊). 

Mode of action Non-systemic insecticide with contact, stomach, and respiratory action.  Uses Control of Coleoptera, Diptera, Homoptera and Lepidoptera in soil or on foliage in over 100 crops