Title: Methidathion
CAS Registry Number: 950-37-8
CAS Name: Phosphorodithioic acid S-[(5-methoxy-2-oxo-1,3,4-thiadiazol-3(2H)-yl)methyl] O,O-dimethyl ester
Additional Names: phosphorodithioic acid O,O-dimethyl ester S-ester with 4-(mercaptomethyl)-2-methoxy-D2-1,3,4-thiadiazolin-5-one; dithiophosphoric acid O,O¢-dimethyl-S-[(5-methoxy-1,3,4-thiadiazol-2(3H)-one-3-yl)methyl] ester; O,O¢-dimethyl-S-[(2-methoxy-1,3,4-thiadiazol-5(4H)-one-4-yl)methyl] dithiophosphate
Manufacturers' Codes: GS-13005
Trademarks: Supracid(e) (Syngenta); Ultracid(e) (Syngenta)
Molecular Formula: C6H11N2O4PS3
Molecular Weight: 302.33
Percent Composition: C 23.84%, H 3.67%, N 9.27%, O 21.17%, P 10.25%, S 31.82%
Literature References: Synthesis and degradation products: Rüfenacht, Helv. Chim. Acta 51, 518 (1968); FR 1335755 (1963 to Geigy), C.A. 60, 1764g (1964). Metabolism in rats: Esser et al., Helv. Chim. Acta 51, 513 (1968). Acute toxicity: T. B. Gaines, R. E. Linder, Fundam. Appl. Toxicol. 7, 299 (1986). Carcinogenicity studies: J. A. Quest et al., Regul. Toxicol. Pharmacol. 12, 117 (1990).
Properties: Crystals from methanol, mp 39-40°. Soly in water <1%. Readily sol in benzene, acetone, methanol, xylene and other org solvents. LD50 in adult male, female rats (mg/kg): 31, 32 orally (Gaines, Linder).
Melting point: mp 39-40°
Toxicity data: LD50 in adult male, female rats (mg/kg): 31, 32 orally (Gaines, Linder)
Use: Insecticide, acaricide.

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