Abstract
AbstractInfrared and 1H nmr spectra of 4‐oxo, 1, and 4‐imino, 2, quinolizine derivatives or their monocyclic tautomers 3, 4 have been comparatively studied. The number of ethoxycarbonyl groups, the signals of the hetero proton, the C(9)‐H, and the C(6)‐CH3 group in the 1H nmr spectrum, moreover the N‐H stretching vibration bands proved to be diagnostically important for monocyclic or bicyclic as well as for 4‐oxo or 4‐imino structures. A weak intramolecular hydrogen bridge in compounds 2b and 2f, a strong chelate type hydrogen bridge in 4E and 4F=G could have been demonstrated as well.
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