Structural Formula Vector Image
Title: Coumaphos
CAS Registry Number: 56-72-4
CAS Name: Phosphorothioic acid O-(3-chloro-4-methyl-2-oxo-2H-1-benzopyran-7-yl) O,O-diethyl ester
Additional Names: 3-chloro-7-hydroxy-4-methylcoumarin O-ester with O,O-diethyl phosphorothioate; 3-chloro-4-methylumbelliferone O-ester with O,O-diethyl phosphorothioate; O,O-diethyl O-(3-chloro-4-methyl-7-coumarinyl) phosphorothioate; O,O-diethyl O-(3-chloro-4-methylumbelliferone) thiophosphate; coumafos
Manufacturers' Codes: Bayer 21/199
Trademarks: Asuntol (Bayer); Baymix (Chemagro); Co-ral (Chemagro); Meldane (Chemagro); Muscatox (Bayer); Resitox (Bayer)
Molecular Formula: C14H16ClO5PS
Molecular Weight: 362.77
Percent Composition: C 46.35%, H 4.45%, Cl 9.77%, O 22.05%, P 8.54%, S 8.84%
Literature References: Prepn: Schrader, DE 881194; US 2748146 (1951, 1956 both to Bayer); Krueger et al., J. Agric. Food Chem. 7, 183 (1959). Toxicity: T. B. Gaines, Toxicol. Appl. Pharmacol. 14, 515 (1969).
Properties: Crystals, mp 91°. The commercial product may be slightly brownish. Practically insol in water. Somewhat sol in acetone, chloroform, corn oil. Stable in water. LD50 in female, male rats (mg/kg): 16, 41 orally (Gaines).
Melting point: mp 91°
Toxicity data: LD50 in female, male rats (mg/kg): 16, 41 orally (Gaines)
Use: Insecticide, nematocide.
Therap-Cat-Vet: Anthelmintic.

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