Premium
Complete assignment of the 1 H and 13 C 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
Author(s) -
Musmar M. J.,
Castle Raymond N.
Publication year - 1991
Publication title -
journal of heterocyclic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.321
H-Index - 59
eISSN - 1943-5193
pISSN - 0022-152X
DOI - 10.1002/jhet.5570280610
Subject(s) - heteronuclear molecule , chemistry , spectral line , nmr spectra database , resonance (particle physics) , two dimensional nuclear magnetic resonance spectroscopy , carbon 13 nmr satellite , carbon 13 nmr , proton , crystallography , nuclear magnetic resonance spectroscopy , stereochemistry , nuclear magnetic resonance , fluorine 19 nmr , atomic physics , physics , nuclear physics , astronomy
The 1 H and 13 C 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 1 H and 13 C 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.