Halohydrin

A halohydrin is a type of chemical compound or functional group in which one carbon atom has a substituent of the halogen group and an adjacent carbon atom has a hydroxyl substituent.

Halohydrin formation:
 * from an alkene in a halohydrin formation reaction
 * from an epoxide by a hydrohalic acid

Halohydrin reactions:
 * In presence of a base, such as potassium hydroxide, a halohydrin may undergo internal SN2 reaction to form an epoxide. This is the reverse of the formation reaction from an epoxide.
 * Epoxidation in biological systems can be catalyzed by halohydrin dehalogenase.