__ are easily made from alkenes, and (unlike other ether) they undergo a variety of useful synthetic reactions. For these reasons, __ are valuable synthetic intermediates. __ is the process.
__ are used to convert alkenes to epoxides. If the reaction takes place in aqueous acid, the epoxide opens to a __. Therefore, to make an epoxide, we avoid strong acids. Because of its desirable solubility properties, __ is often used for these __. It is a weakly acidic __ that is soluble in aprotic solvents like CH2Cl2