A convenient method for the preparation of N-unsubstituted hydrazones of aromatic ketones and aldehydes

Article abstract of DOI:10.1007/BF02494871

A general and useful method for the synthesis of N-unsubstituted hydrazones of aromatic ketones and aldehydes in good yields was elaborated. The use of a large excess of hydrazine hydrate and catalytic amounts of p-toluenesulfonic acid makes it possible to prepare the hydrazones without an admixture of the corresponding azine.