Isotopic multiplets in the carbon-13 nuclear magnetic resonance spectra due to partial deuteriation of co-ordinated NH2 and NH groups of cobalt(III) complexes containing an N-glycoside. Importance of sugar ring oxygen atoms in the long-range isotope shifts

1989 ◽  
pp. 1241 ◽  
Author(s):  
Katsuaki Ishida ◽  
Masanobu Hidai ◽  
Morio Yashiro ◽  
Sadao Yoshikawa ◽  
Shigenobu Yano
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Long Range ◽  
Isotope Shifts ◽  
Nuclear Magnetic Resonance Spectra ◽  
Sugar Ring ◽  
Magnetic Resonance Spectra ◽  
Nuclear Magnetic ◽  
Oxygen Atoms

Carbon-13 Nuclear Magnetic Resonance Spectra of Carcinogenic Polynuclear Hydrocarbons. II. Benzo[a]pyrene

1975 ◽  
Vol 53 (12) ◽  
pp. 1829-1832 ◽  
Author(s):  
Gerald W. Buchanan ◽  
Richard S. Ozubko
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Model Compound ◽  
Isotope Shifts ◽  
Signal Assignment ◽  
Nuclear Magnetic Resonance Spectra ◽  
Magnetic Resonance Spectra ◽  
Nuclear Magnetic

13C n.m.r. signal assignments are presented for the carcinogenic polynuclear hydrocarbon benzo[a]pyrene. In addition to selective 1H decoupling, valuable information is obtained from the magnitudes of the α-, β-, and "peri" deuterium isotope shifts in the 1,3,6-trideuterio analog. The applicability of the model compound approach to signal assignment is explored in detail.

Fluorine magnetic resonance studies. III. Fluorine-fluorine coupling over six and seven bonds in fluorostyrenes

1977 ◽  
Vol 30 (3) ◽  
pp. 543 ◽  
Author(s):  
DA Burgess ◽  
ID Rae ◽  
JD Snell
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Aromatic Ring ◽  
Long Range ◽  
Magnetic Resonance Studies ◽  
Nuclear Magnetic Resonance Spectra ◽  
Magnetic Resonance Spectra ◽  
Nuclear Magnetic

The 19F nuclear magnetic resonance spectra of β,β-difluorostyrenes and 1-difluoromethyleneindans bearing fluorine substituents in the aromatic ring have been recorded and the long-range couplings 6JF,F and 7JF,F are discussed. In each compound the larger couplings are to the olefinic fluorine trans to the aromatic ring. The couplings are maximum in the planar indans, reducing to unobservable values when non-planarity is achieved in suitably substituted styrenes. The allylic coupling 4JH,F involving olefinic fluorines shows only slight stereochemical dependence.

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