Illustrated Glossary of Organic Chemistry

Hydrazone: A functional group containing the R₂C=N-NR₂ moiety, or a molecule containing this functional group.

General hydrazone structure.


Reaction of acetone with hydrazine gives propan-2-ylidenehydrazine, a simple hydrazone.


Reaction of benzaldehyde with 2,4-dinitrophenylhydrazine (2,4-DNPH) gives 1-benzylidene-2-(2,4-dinitrophenyl)hydrazine. Hydrazones derived from 2,4-DNPH are often colored (red or orange) due to extensive conjugation.