The most common methods for their preparation are treatment of halohydrins with aqueous base, and ox
The most common methods for their preparation are treatment of halohydrins with aqueous base, and oxidation of alkenes with peroxycarboxylic acids.  The simplest member is used as a chemical sterilant, and its reaction with Grignard reagents is a convenient way to lengthen a carbon chain by two atoms.  Their high strain makes them highly reactive, and they undergo ring-opening reactions with a variety of nucleophiles.  Containing an oxygen atom in a three-member ring, FTP, name these cyclic ethers.
The most common methods for their preparation are treatment of halohydrins with aqueous base, and oxidation of alkenes with peroxycarboxylic acids.  
epoxides or oxiranes