Solvent-free selective oximation of aldehydes using facile and reusable heterogenous polyoxometalate

The efficiency of various heteropoly compounds as well-known solid acids was investigated and a new procedure was developed for synthesis of Z-isomers of aldoximes. This method consistently has the advantage of excellent yields and short reaction times. Furthermore, the catalyst could be easily recovered after completion of the reaction and reused without a considerable loss of its activity.