: Novel β-hydroxy oxime O-ethers, as potentialβ-adrenergic blocking agents, were synthesized from the aqueous-mediated (H 2 O-DMSO, 7:3) O-alkylation of oximes with epoxides in the presence of potassium hydroxide at room temperature. The O-alkylation was regioselective and ( £ )-oxime ethers were the main products. The results of quantum mechanical studies used to rationalize the experimental outcomes