Fe3O4@Ni: A High Performance Recyclable Catalyst for Preparation of Oximes

Oximes are highly crystalline materials and oximation isvery efficient method for characterization and purification ofcarbonyl compounds. These compounds not only represent auseful series of derivatives of carbonyl compounds but alsomay be used as intermediates for the preparation of amides bythe Beckmann rearrangement, nitrones, hydroximinoylchlorides, nitrile oxide and chiral α-sulfinyl oximes [1].The usual method for thepreparation of oximes involves treatment of aldehydes orketones with hydroxylamine [2]. In addition, a largenumber of other methods have been reported for performingof this transformation [3]. However, some methods in thisarea are not very satisfactory due to drawbacks such as lowyields, inability for the preparation of aromatic ketoximes, long reaction times, tedious work up and effluent pollution.In this work, we have used the nanomagnetic core-shell Fe3O4@Ni as a heterogeneous catalyst for thepreparation of oximes in water (Figure 1).