Title: DMMP
CAS Registry Number: 756-79-6
CAS Name: Methylphosphonic acid dimethyl ester
Additional Names: dimethyl methylphosphonate
Molecular Formula: C3H9O3P
Molecular Weight: 124.08
Percent Composition: C 29.04%, H 7.31%, O 38.68%, P 24.96%
Literature References: Testing chemical to simulate nerve agents such as sarin, q.v. Prepn: T. Milobedzki, K. Szulgin, Chem. Zentralbl. 89, 914 (1918); by photolysis: M. Nakamura et al., J. Chem. Soc. Perkin Trans. 1 1994, 141. Photodestruction: L. J. Radziemski, Jr., J. Environ. Sci. Health B16, 337 (1981). Raman spectroscopic determn: N. Taranenko et al., J. Raman Spectrosc. 27, 379 (1996). Use as simulant in compd destruction study: M. G. Nickelsen et al., J. Adv. Oxid. Technol. 3, 43 (1998). Use as cell volume probe: J. E. Raftos et al., Biochim. Biophys. Acta 968, 160 (1988); J. A. Barry et al., Biochemistry 32, 4665 (1993). Description of use as flame retardant: E. D. Weil in Kirk-Othmer Encyclopedia of Chemical Technology vol. 10 (John Wiley, New York, 4th ed., 1993) pp 976-998. Review of toxicology: J. C. Rowland et al., Health Advisory for Dimethyl Methylphosphonate (DMMP) (PB 93-117018, 1993) 86 pp.
Properties: Colorless liquid, mp <50°. bp754 181°. d 1.145. Vapor pressure: (20°) <0.1 torr; (25°) 2.4 torr; (65°) 20 torr. pKa (20°) in water: 2.37. Sol in water. Miscible in alcohol, ether, benzene, acetone, carbon tetrachloride. Insol in heavy mineral oil. n 1.411. Log P (octanol/water): -1.88. LD50 in rats, mice (mg/kg): 10190, >6810 orally (Rowland).
Melting point: mp <50°
Boiling point: bp754 181°
pKa: pKa (20°) in water: 2.37
Index of refraction: n 1.411
Log P: Log P (octanol/water): -1.88
Density: d 1.145
Toxicity data: LD50 in rats, mice (mg/kg): 10190, >6810 orally (Rowland)
Use: NMR probe for cell volume. Flame retardant. Simulant for nerve agents.
DMPA DMPO Dobesilate Calcium Dobutamine Docarpamine

Dimethyl methylphosphonate
Dimethyl methylphosphonate.svg
CAS number 756-79-6 YesY
PubChem 12958
ChemSpider 12418 YesY
Jmol-3D images Image 1
Molecular formula C3H9O3P
Molar mass 124.08 g mol−1
Appearance colourless liquid
Density 1.145 g/mL at 25 °C
Melting point −50 °C; −58 °F; 223 K
Boiling point 181 °C; 358 °F; 454 K
Solubility in water slowly hydrolyses
R-phrases R46, R36
Main hazards Toxic
Flash point 69 °C - closed cup
  • Oral (rat) 8,210 mg/kg
  • Inhalation (rat) 1h 20.13 mg/l
  • Dermal (rabbit) >2,000 mg/kg
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Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

Dimethyl methylphosphonate is an organophosphorus compound with the chemical formula C3H9O3P or CH3PO(OCH3)2. It is a colourless liquid which is primarily used as a flame retardant.