Condensation of acetylnaphthols with trifluoro- and trichloro-acetonitriles. The first example of ring-chain isomerism in the aromatic β-hydroxyoxoenamine series

In contrast to 2-acetylnaphth-l-ol, condensation of l-acetylnaphth-2-ol with trifluoro- and trichloro-acetonitriles does not stop at ring-opening of the hydroxyoxoenamine form, but leads instead to 2-amino-2-trifluoro(trichloro)methyl-5,6-benzo-4-chromanones.