Tautomerism in 10-(hydroxyimino)phenanthren-9-one

Abstract

In the title compound, C14H9NO2, a static disorder exists between the keto–oxime and hydroxy–nitroso tautomers, in an approximate ratio of 4.6:1, based on refined occupancies for disordered parts. No intermolecular hydrogen bonding is present in the crystal structure. Instead, both tautomers exhibit similar intramolecular O—H...O hydrogen bonds.