New synthetic route to trialkyloxonium salts: alkylation of ethers with acyldialkyl cations

Abstract
Acylium cations or complexes of acyl halides with nonmetal halides (e.g. PhCO+SbF6 or PhCOClSbCl5) react at low temperature with an excess of alkyl ethers (e.g. Me2O or Et2O) giving the corresponding trialkyloxonium salts.

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