Title: Phosmet
CAS Registry Number: 732-11-6
CAS Name: Phosphorodithioic acid S-[(1,3-dihydro-1,3-dioxo-2H-isoindol-2-yl)methyl] O,O-dimethyl ester
Additional Names: phosphorodithioic acid O,O-dimethyl ester S-ester with N-(mercaptomethyl)phthalimide; O,O-dimethyl S-phthalimidomethyl phosphorothionate; N-(mercaptomethyl)phthalimide S-(O,O-dimethyl phosphorodithioate); phthalophos (USSR)
Manufacturers' Codes: ENT-25705; R-1504
Trademarks: Imidan (Stauffer); Prolate (Stauffer)
Molecular Formula: C11H12NO4PS2
Molecular Weight: 317.32
Percent Composition: C 41.64%, H 3.81%, N 4.41%, O 20.17%, P 9.76%, S 20.21%
Literature References: Prepn: Fancher, US 2767194 (1956 to Stauffer). Activity: B. A. Butt, J. C. Keller, J. Econ. Entomol. 54, 813 (1961). GC determn in produce: M. A. Luke et al., J. Assoc. Off. Anal. Chem. 64, 1187 (1981). Toxicity study: T. B. Gaines, Toxicol. Appl. Pharmacol. 14, 515 (1969).
Properties: Off-white, crystalline solid, mp 71.9°. Tech product (95-98% pure), mp 66.5-69.5°. Dec below its boiling point. Vapor pressure at 50°: 1 ´ 10-3 mm Hg. Soly in water at 25°: 25 ppm. LD50 in male, female rats (mg/kg): 113, 160 orally (Gaines).
Melting point: mp 71.9°; mp 66.5-69.5°
Toxicity data: LD50 in male, female rats (mg/kg): 113, 160 orally (Gaines)
Use: Insecticide, acaricide.

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