Title: Temephos
CAS Registry Number: 3383-96-8
CAS Name: O,O¢-(Thiodi-4,1-phenylene)phosphorothioic acid O,O,O¢,O¢-tetramethyl ester
Additional Names: O,O¢-(thiodi-4,1-phenylene)bis(O,O¢-dimethylphosphorothioate); O,O,O¢,O¢-tetramethyl O,O¢-thiodi-p-phenylene phosphorothioate; phosphorothioic acid O,O-dimethyl ester O,O-diester with 4,4¢-thiodiphenol
Manufacturers' Codes: ENT-27165; AC-52160
Trademarks: Abate (BASF); Biothion
Molecular Formula: C16H20O6P2S3
Molecular Weight: 466.47
Percent Composition: C 41.20%, H 4.32%, O 20.58%, P 13.28%, S 20.62%
Literature References: Prepn: J. B. Lovell, R. W. Baer, BE 648531 C.A. 63, 11433e (1965); eidem, US 3317636 (1964, 1967 both to Am. Cyanamid). Metabolism: R. C. Blinn, J. Agric. Food Chem. 17, 118 (1969). Toxicity study: T. B. Gaines, Toxicol. Appl. Pharmacol. 14, 515 (1969).
Properties: Crystalline solid, mp 30.0-30.5°. Optimum stability at pH 5-7. Sol in acetonitrile, carbon tetrachloride, ether, dichloroethane, toluene. Almost insol in water, hexane. LD50 in male, female rats (mg/kg): 8600, 13000 orally (Gaines).
Melting point: mp 30.0-30.5°
Toxicity data: LD50 in male, female rats (mg/kg): 8600, 13000 orally (Gaines)
CAUTION: Potential symptoms of overexposure are eye irritation, blurred vision; dizziness, confusion; dyspnea; salivation; abdominal cramps, nausea, diarrhea, vomiting. See NIOSH Pocket Guide to Chemical Hazards (DHHS/NIOSH 97-140, 1997) p 296.
Use: Insecticide.

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