text: Nitrolic acids are organic compounds with the functional group RC(NO)=NOH.  They are prepared by the reaction of nitroalkanes with base and nitrite sources:
  :RCHNO  +  HNO  →   RC(NO)=NOH  +  HO  
  The conversion was first demonstrated by Victor Meyer using nitroethane.  The reaction proceeds via the intermediacy of the nitronate anion.