Nitrogen bridgehead compounds. Part 69. Studies on quinolizine derivatives. Part 3. Infrared and 1H NMR spectroscopic studies of quinolizine derivatives and their monocyclic tautomers |
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Authors: | Angla Schwartz Zoltn Pl Lszl Szab Istvn Hermecz Zoltn Mszros |
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Institution: | Angéla Schwartz,Zoltán Pál,László Szabó,István Hermecz,Zoltán Mészáros |
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Abstract: | Infrared 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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