| IUPAC name
| Other names
Methyl ethylene oxide
|Molar mass||58.080 g/mol|
|Appearance||Colorless volatile liquid|
|Density|| 0.859 g/cm3 (0 °C)|
0.8304 g/cm3 (20 °C)
|Melting point||−111.9 °C (−169.4 °F; 161.2 K)|
|Boiling point||35 °C (95 °F; 308 K)|
| 40 g/100 ml (20 °C)|
59 g/100 ml (25 °C)
|Solubility||Miscible with acetone, benzene, carbon tetrachloride, diethyl ether, ethanol, methanol|
|Vapor pressure||445 mmHg (20°C)|
Std enthalpy of
|Safety data sheet||Sigma-Aldrich (racemic)|
|Flash point||−37 °C (−35 °F; 236 K)|
|Lethal dose or concentration (LD, LC):|
LD50 (Median dose)
| 660 mg/kg (guinea pig, oral)|
380 mg/kg (rat, oral)
440 mg/kg (mouse, oral)
1140 mg/kg (rat, oral)
690 mg/kg (guinea pig, oral)
LC50 (Median concentration)
| 1740 ppm (mouse, 4 h)|
4000 ppm (rat, 4 h)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Propylene oxide (sometimes called 1,2-propylene oxide to distinguish it from its isomer 1,3-propylene oxide, better known as oxetane) is an organic compound with the molecular formula CH3(CHCH2)O.
The molecule is a chiral, although it is commonly used as a racemic mixture.
Like other epoxides, PO undergoes ring-opening reactions. With water, propylene glycol is produced. Grignard reagents add to propylene oxide to give secondary alcohols.
Propylene oxide is a volatile colorless clear liquid
Propylene oxide is sold by chemical suppliers.
Propylene oxide is commonly synthesized via the conversion of propylene to propylene chlorohydrin using chlorine dissolved in water (aka hypochlorous acid), which is converted to the epoxide using a base.
- Make propylene glycol
It is a probable human carcinogen, and is included into the List of IARC Group 2B carcinogens.
Propylene oxide should be kept in closed bottles, away from heat or sunlight.
Should be burned outside.