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style="background: #F8EABA; text-align: center;" colspan="2" | Identifiers
CAS number 557-17-5
PubChem 11182
EC number 209-158-7
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InChI Script error: No such module "collapsible list".
style="background: #F8EABA; text-align: center;" colspan="2" | Properties
Molecular formula C4H10O
Molar mass 74.12
Density 0.7356
Solubility in water 30.5 g/L
Refractive index (nD) 1.35837 (14.3 C)
Viscosity 0.3064 cp (0.3 C)
style="background: #F8EABA; text-align: center;" colspan="2" | Pharmacology
Routes of
style="background: #F8EABA; text-align: center;" colspan="2" | Hazards
NFPA 704
Flash point < -20
Explosive limits 1.9-11.8
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
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.


el:Μεθυλοπροπυλαιθέρας fr:Méthoxypropane pt:Metoxipropano