Nitroacetic acid was fused with eighteen aromatic aldehydes and gave the respective β-nitrostyrenes. It was more reactive towards aldehydes with electron-withdrawing than with electron-releasing substituents. Nitromethane adducts or nitro-olefins were formed from the reaction of enamines with nitroacetic acid. Di-(3,4-dihydro-4-nitromethylquinazolinium) carbonate was obtained in good yield from quinazoline and nitroacetic acid.