Diazinon
Title: Diazinon
CAS Registry Number: 333-41-5
CAS Name: Phosphorothioic acid O,O-diethyl O-[6-methyl-2-(1-methylethyl)-4-pyrimidinyl] ester
Additional Names: thiophosphoric acid 2-isopropyl-4-methyl-6-pyrimidyl diethyl ester; O,O-diethyl O-2-isopropyl-4-methyl-6-pyrimidyl thiophosphate; diethyl 2-isopropyl-4-methyl-6-pyrimidyl thionophosphate; dimpylate
Manufacturers' Codes: G-24480
Trademarks: Antigal (Streuli); Basudin (Syngenta); Diazol (Makhteshim-Agan); HelfaCat (Helvepharm); HelfaDog (Helvepharm); Neocidol (Novartis); Parasitex (Virbac); Sarolex; Spectracide; Taberdog (Nipa); Tabergat (Nipa)
Molecular Formula: C12H21N2O3PS
Molecular Weight: 304.35
Percent Composition: C 47.36%, H 6.95%, N 9.20%, O 15.77%, P 10.18%, S 10.54%
Literature References: Cholinesterase inhibitor. Prepn: Gysin, Margot, US 2754243 (1956 to Geigy). Insecticidal properties: Gasser, Z. Naturforsch. 8b, 225 (1953). Toxicity data: T. B. Gaines, Toxicol. Appl. Pharmacol. 14, 515 (1969). Review of toxicology and human exposure: Toxicological Profile for Diazinon (PB97-121107, 1996) 245 pp.
Properties: Liquid. Faint ester-like odor. d420 1.116-1.118. bp0.002 83-84°. nD20 1.4978-1.4981. Vapor pressure at 20°: 1.4´10-4; at 40°: 1.1´10-3 (~5 times vapor pressure of parathion). Volatility at 20°: 2.4 mg/m3; at 40°: 17.6 mg/m3. Decomposes above 120°. Soly in water at 20°: 0.004%. Miscible with alcohol, ether, petr ether, cyclohexane, benzene, and similar hydrocarbons. More stable in alkaline formulations, then when at neutral or acid pH. LD50 in male, female rats (mg/kg): 250, 285 orally (Gaines).
Boiling point: bp0.002 83-84°
Index of refraction: nD20 1.4978-1.4981
Density: d420 1.116-1.118
Toxicity data: LD50 in male, female rats (mg/kg): 250, 285 orally (Gaines)
CAUTION: Potential symptoms of overexposure are eye irritation; miosis, blurred vision; dizziness, confusion, weakness, convulsions; dyspnea; salivation, abdominal cramps, nausea, vomiting. See NIOSH Pocket Guide to Chemical Hazards (DHHS/NIOSH 97-140, 1997) p 92.
Use: Insecticide.
Therap-Cat-Vet: Ectoparasiticide.

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