Summary: A convenient synthesis of dialkyl peroxides from the reaction of alkyl bromides or alkyl sulfonate es- ters with potassium superoxide, the latter solubilized in benzene by crown ethers, is described. ... Sir: The chemistry of the superoxide radical anion, 02--, in organic systems has been studied very little. On a synthetic scale, superoxide is available to the chemist from two sources, either as the alkali metal salts, potassium superox- ide (KOz) and sodium ...