Title: Chlormephos
CAS Registry Number: 24934-91-6
CAS Name: S-(Chloromethyl)phosphorodithioic acid O,O-diethyl ester
Additional Names: chlormethylfos; O,O-diethyl S-(chloromethyl)dithiophosphate
Manufacturers' Codes: MC-2188
Trademarks: Dotan (Calliope S.A.); Sherman (Calliope S.A.)
Molecular Formula: C5H12ClO2PS2
Molecular Weight: 234.70
Percent Composition: C 25.59%, H 5.15%, Cl 15.11%, O 13.63%, P 13.20%, S 27.32%
Literature References: Non-systemic 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). Photodegradation: S. J. Buckland, R. S. Davidson, Pestic. Sci. 19, 61 (1987). TLC/MS determn in biological samples: H. Brzezinka, N. Bertram, J. Chromatogr. Sci. 40, 609 (2002). Review of physical properties and field trials: F. Colliot et al., Proc. Br. Insect. Fungic. Conf. 7th 2, 557-565 (1973); physical properties and residue analysis: V. P. Lynch, Anal. Methods Pestic. Plant Growth Regul. 10, 49-55 (1978).
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. LD50 in rats (mg/kg): 7 orally; 27 dermally. LC50 in fish: 1.5 mg/l (Lynch).
Boiling point: bp1mm 93-95°; bp0.1 Torr 81-85°
Index of refraction: nD220 1.5244
Absorption maximum: uv max (ethanol): 208 nm
Density: d20 1.260
Toxicity data: LD50 in rats (mg/kg): 7 orally; 27 dermally; LC50 in fish: 1.5 mg/l (Lynch)
Use: Insecticide primarily for soil applications.
Chlormequat Chloride Chlormerodrin Chlormezanone Chlormidazole Chlornitrofen

CAS number 24934-91-6 YesY
PubChem 32739
ChemSpider 30345
Jmol-3D images Image 1
Molecular formula C5H12ClO2PS2
Molar mass 234.70 g mol−1
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

Chlormephos (chemical formula: C5H12ClO2PS2) is an organothiophosphate insecticide. It is listed as an extremely hazardous substance.