Title: Pirimiphos-ethyl
CAS Registry Number: 23505-41-1
CAS Name: O-[2-(Diethylamino)-6-methyl-4-pyrimidinyl]phosphorothioic acid
O,O-diethyl ester
Synonyms: O,O-diethyl
O-[2-(diethylamino)-6-methyl-4-pyrimidinyl]phosphorothioate
Manufacturers' Codes: PP-211
Trademarks: Primicid (Zeneca)
Molecular Formula: C13H24N3O3PS
Molecular Weight: 333.39
Percent Composition: C 46.83%, H 7.26%, N 12.60%, O 14.40%, P 9.29%, S 9.62%
Literature References: Broad spectrum contact and fumigant insecticide. Prepn: B. K. Snell, S. P. Sharpe,
GB 1205000 (1970 to ICI),
C.A. 74, 52482f (1971). Efficacy against wireworms: C. E. Lilly,
J. Econ. Entomol. 66, 1205 (1973). Persistence and degradn in soil: D. L. Suett,
Pestic. Sci. 6, 385 (1975). Review of properties and analytical methods: D. J. W. Bullock,
Anal. Methods Pestic. Plant Growth Regul. 8, 171-184 (1976).
Properties: Straw-colored liquid, dec >130°. d20 1.14;
nD25 1.520. Vapor pressure at 25°: 2.9′10-4 mm Hg. Miscible with most organic solvents. Soly in water (30°): 1 ppm. Weakly basic. uv max (methanol): 248 nm (e 21300). LD50 in rats, mice, guinea pigs (mg/kg); 140-200, 105, 50-150 orally; dermally in rats: 1000-2000 mg/kg (Bullock).
Index of refraction: nD25 1.520
Absorption maximum: uv max (methanol): 248 nm (e 21300)
Density: d20 1.14
Toxicity data: LD50 in rats, mice, guinea pigs (mg/kg); 140-200, 105, 50-150 orally; dermally in rats: 1000-2000 mg/kg (Bullock)
Derivative Type: O,O-Dimethyl analog
CAS Registry Number: 29232-93-7
Synonyms: Pirimiphos-methyl
Manufacturers' Codes: PP-511
Trademarks: Actellic (Syngenta); Actellifog (Zeneca); Blex (Zeneca); Dominator (Schering); Silosan (Zeneca)
Molecular Formula: C11H20N3O3PS
Molecular Weight: 305.33
Percent Composition: C 43.27%, H 6.60%, N 13.76%, O 15.72%, P 10.14%, S 10.50%
Properties: Straw-colored liquid, d30 1.157;
nD25 1.527. Vapor press at 30°: ~1′10-4 mm Hg. Soly in water at 30°: 5 mg/l.
Index of refraction: nD25 1.527
Density: d30 1.157
Use: Insecticide.
Therap-Cat-Vet: Ectoparasiticide.
