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The reactions of oximes with benzyl bromide catalyzed by benzyldimethyltetradecylammonium chloride are carried out at room temperature for 30-60 min in aqueous sodium hydroxide solution under ultrasound irradiation to offer O-benzyl oxime derivatives in 60-96% yields. In comparison to classical methods, the advantages of the present procedure include short reaction time, high yields and environmental friendliness.