2103. Chlormephos

Nomenclature

CAS number: 24934-91-6
S-(Chloromethyl)phosphorodithioic acid O,O-diethyl ester; chlormethylfos; O,O-diethyl S-(chloromethyl)dithiophosphate; MC-2188; Dotan.
C5H12ClO2PS2; mol wt 234.70.
C 25.59%, H 5.15%, Cl 15.11%, O 13.63%, P 13.20%, S 27.32%.

Description and references

Non-systemic organophosphate insecticide; cholinesterase inhibitor. Prepn: O. Scherer et al., DE 1015794; eidem, GB 817360 (1957, 1959 both to Hoechst); W. W. Brand et al., Phosphorus Sulfur 10, 183 (1981) DOI. Photodegradation: S. J. Buckland, R. S. Davidson, Pestic. Sci. 19, 61 (1987) DOI. TLC/MS determn in biological samples: H. Brzezinka, N. Bertram, J. Chromatogr. Sci. 40, 609 (2002) PubMed. Review of physical properties and field trials: F. Colliot et al., Proc. 7th Br. Insectic. Fungic. Conf. 2, 557-565 (1973); physical properties and residue analysis: V. P. Lynch, Anal. Methods Pestic. Plant Growth Regul. 10, 49-55 (1978).

Chemical structure

Properties

Water-white oil. bp1mm 93-95°; bp0.1 Torr 81-85°. Vapor pressure (30°): 5.7 x 10-2. Miscible with most organic solvents. Soly in water (20°): 60 ppm. d20 1.260. nD220 1.5244. uv max (ethanol): 208 nm. Poisonous. LD50 in rats (mg/kg): 7 orally; 27 dermally. LC50 in fish: 1.5 mg/l (Lynch).

Use

Insecticide primarily for soil applications.