Complete assignment of the1H and13C NMR Spectra of 11,12-Dimethoxy[1]benzothieno[3,2-a]-4,7-phenanthroline and its 8-Chloro Analogue: Concerted Use of Two-Dimensional NMR Techniques

Autor:	Raymond N. Castle, M. J. Musmar
Rok vydání:	1991
Předmět:	Crystallography chemistry.chemical_compound Proton Heteronuclear molecule chemistry Phenanthroline Organic Chemistry Resonance Nuclear magnetic resonance spectroscopy Carbon-13 NMR Spin (physics) Spectral line
Zdroj:	Journal of Heterocyclic Chemistry. 28:1533-1536
ISSN:	1943-5193 0022-152X
DOI:	10.1002/jhet.5570280610
Popis:	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 resonances.
Databáze:	OpenAIRE
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