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CAS number 557-17-5 YesY
PubChem 11182
ChemSpider 10709 YesY
EC number 209-158-7
Jmol-3D images Image 1
Molecular formula C4H10O
Molar mass 74.12
Density 0.7356 g/cm3
Boiling point 38.8 °C (101.8 °F; 311.9 K)
Solubility in water 30.5 g/L
Refractive index (nD) 1.35837 (14.3 °C)
Viscosity 0.3064 cP (0.3 °C)
Routes of
NFPA 704
Flammability code 3: Liquids and solids that can be ignited under almost all ambient temperature conditions. Flash point between 23 and 38 °C (73 and 100 °F). E.g., gasoline) Health code 0: Exposure under fire conditions would offer no hazard beyond that of ordinary combustible material. E.g., sodium chloride Reactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
Flash point < -20 °C
Explosive limits 1.9-11.8
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Methoxypropane, or methyl propyl ether, is an ether once used as a general anaesthetic.[1] It is a clear colorless flammable liquid with a boiling point of 38.8 °C.[2]

Marketed under the trade names Metopryl and Neothyl, methoxypropane was used as an alternative to diethyl ether because of its greater potency. Its use as an anaesthetic has since been supplanted by modern halogenated ethers which are much less flammable.


  1. ^ White, Mary Louise T.; Shane, Sylvan M.; Krantz, John C., Jr. "Anesthesia. XXI. Propyl methyl ether as an inhalation anesthetic in man", Anesthesiology, (1946), 7, 663-7.
  2. ^ Merck Index, 11th edition, 6031.