An-Najah National University



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  • Monday, June 24, 1991
  • Complete Assignment of the 1H and 13C NMR Spectra of 11,12-Dimeth-oxy[1]benzothieno[3,2-a]-4,7-phenanthroline and its 8-Chloro Analogue: Concerted Use of Two-Dimensional NMR Techniques [1]
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  • The 1H and 13C nmr spectra of 11,12-dimethoxy[1]benzothieno[3,2-a]4,7-phenanthroline and its 8-chloro precursor were totally assigned using a combination of two-dimensional nmr techniques. After correlation of the majority of the proton signals by a COSY spectrum and one-bond heteronuclear correlation, the full as­signment of the 1H and 13C nmr spectra of the novel heterocyclic compounds required the application of long-range CH coupling information particularly for quaternary carbon resonance assignments and the orientations of individual spin systems relative to one another. Key long-range heteronuclear couplings in both compounds served to confirm the one-bond heteronuclear correlations. Unequivocal interpretation of the spectral data leads to the complete assignments of the reasonances.

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Mohammed Jawad Musmar
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