Their sulfurous equivalents are known as sulfides, while cyclic ones are formed by reacting an alkene with a peroxy-acid and are known as epoxides.  
These compounds can be formed by alkoxy-mercuration between an alkene and an alcohol.  Their sulfurous equivalents are known as sulfides, while cyclic ones are formed by reacting an alkene with a peroxy-acid and are known as epoxides.  Another cyclic class is known as the crown type, and they are most often produced in an SN2 reaction between an alkoxide and an alkyl halide, known as the Williamson synthesis.  For 10 points, name this class of compounds with an oxygen atom between two carbons, whose di-ethyl variety was commonly used as an anesthetic.
These compounds can be formed by alkoxy-mercuration between an alkene and an alcohol.  
ethers