title: 4'-Nitroflavonol
text: # 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.
  
  