Structural Formula Vector Image
Title: Fonofos
CAS Registry Number: 944-22-9
CAS Name: Ethylphosphonodithioic acid O-ethyl S-phenyl ester
Additional Names: O-ethyl S-phenyl ethylphosphonothiolothionate
Manufacturers' Codes: N-2790
Trademarks: Dyfonate (Stauffer)
Molecular Formula: C10H15OPS2
Molecular Weight: 246.33
Percent Composition: C 48.76%, H 6.14%, O 6.50%, P 12.57%, S 26.03%
Literature References: Organophosphorus insecticide; cholinesterase inhibitor. Prepn: Szabo et al., US 2988474 (1961 to Stauffer); H. M. Pitt, R. A. Simone, DE 2002629; eidem, US 3642960 (1970, 1972 both to Stauffer). Toxicity and biochemistry of racemate and isomers: P. W. Lee et al., Pestic. Biochem. Physiol. 8, 146 (1978). Acute toxicity data: R. Ben-Dyke et al., World Rev. Pest Control 9, 119 (1970).
Properties: Light yellow liquid, bp0.1 130°. d2525 1.16. nD30 1.5883. Practically insol in water. Miscible with organic solvents. LD50 in mice (mg/kg): 14.0 orally, 4.8 i.p. (Lee). LD50 in rats (mg/kg): 3-17 orally, 147 dermally (Ben-Dyke).
Boiling point: bp0.1 130°
Index of refraction: nD30 1.5883
Density: d2525 1.16
Toxicity data: LD50 in mice (mg/kg): 14.0 orally, 4.8 i.p. (Lee); LD50 in rats (mg/kg): 3-17 orally, 147 dermally (Ben-Dyke)
CAUTION: Potential symptoms of overexposure are nausea, vomiting, abdominal cramps, diarrhea, salivation; headache, giddiness, vertigo, weakness; rhinorrhea, chest tightness; blurred vision, miosis; cardiac irregularities; muscle fasciculations; dyspnea. See NIOSH Pocket Guide to Chemical Hazards (DHHS/NIOSH 97-140, 1997) p 146.
Use: Soil insecticide.

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