Structural Formula Vector Image
Title: VX
CAS Registry Number: 50782-69-9
CAS Name: Methylphosphonothioic acid S-[2-[bis(1-methylethyl)amino]ethyl] O-ethyl ester
Additional Names: O-ethyl S-[2-(diisopropylamino)ethyl]methylphosphonothioate; Tx 60
Molecular Formula: C11H26NO2PS
Molecular Weight: 267.37
Percent Composition: C 49.41%, H 9.80%, N 5.24%, O 11.97%, P 11.58%, S 11.99%
Literature References: Nerve gas. Prepn: R. V. Ley, G. L. Sainsbury, GB 1346409; A. W. Wardrop, C. Stratford, GB 1346410 (both 1974 to U.K. Sec. of State for Defence), C.A. 81, 4068y, 4069z (1974); S. R. Eckhaus et al., US 3911059 (1975 to U.S.A. Sec. for Army). Activity studies in humans: F. R. Sidell, W. A. Groff, Toxicol. Appl. Pharmacol. 27, 241 (1974); F. N. Craig et al., J. Invest. Dermatol. 68, 357 (1977). Toxicity study: J. J. Gordon, L. Leadbeater, Toxicol. Appl. Pharmacol. 40, 109 (1977).
Properties: Nonvolatile, odorless liquid. pKa¢ 7.9. LD50 s.c. in rabbits: 15.4 mg/kg (Gordon, Leadbeater).
pKa: pKa¢ 7.9
Toxicity data: LD50 s.c. in rabbits: 15.4 mg/kg (Gordon, Leadbeater)
CAUTION: Cholinesterase inhibitor; more potent than sarin, q.v.
Use: Chemical warfare agent.

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