Tautomerism in 2-ketomethylquinolineazines

A series of new azines were prepared in three steps. Structures of all compounds have been elucidated using spectroscopic methods and elemental analysis. Our studies show that in chloroform solution generally two tautomeric forms are in equilibrium. In some cases, one tautomer was the dominant species.

► Structure of a new series 2-ketomethylquinolineazines and identification of their tautomeric forms.
► Strength intramolecular hydrogen bonding.
► Different tautomers to be present in solutions.
► Tauatomerism.
► Azines.