Oximes of ketones and aldehydes are efficiently converted to the corresponding carbonyl compounds, using a combination of NaHSO4·H2O and paraformaldehyde in good to excellent yields under solid state conditions at room temperature for 10 minutes. Oximes of ketones and aldehydes are effectively converted to the corresponding carbonyl compounds, using a combination of NaHSO4 · H2O and paraformaldehyde in good to excellent yields under solid state conditions at room temperature for 10 minutes.