2,3-Epoxybutane

2,3-Epoxybutane is an organic compound with the formula CH3CH(O)CHCH3. It is an epoxide. The compound exists as three stereoisomers, a pair of enantiomers and the meso isomer. All are colorless liquids.

Preparation and reactions
2,3-Epoxybutane is prepared from 2-butene via the chlorohydrin:
 * CH3CH=CHCH3 +  HOCl   →   CH3CH(OH)CH(Cl)CH3
 * CH3CH(OH)CH(Cl)CH3 →   CH3CH(O)CHCH3  +  HCl

A common reaction is its hydration to 2,3-butanediol. Many such ring-opening reactions have been reported.