4'-Nitroflavonol

4'-Nitroflavonol is a pale yellow solid. This substance belongs to the subclass of flavonols of the class of flavonoids.

Synthesis
4'-Nitroflavonol can be synthesized by the Algar–Flynn–Oyamada reaction of the chalcone formed from 4-nitrobenzaldehyde and 2-hydroxyacetophenone.

Properties
Fluorescence is reported despite the presence of a nitro group at the 4' position of the molecule, which is known as a fluorescence quencher. An excited state intramolecular proton transfer reaction for 4'-nitroflavonol has also been observed.