scholarly journals Long-range Proton-proton Spin Coupling Constants in Thienothiophenes.

1970 ◽  
Vol 24 ◽  
pp. 105-115 ◽  
Author(s):  
Andreas Bugge ◽  
Bo Gestblom ◽  
Ola Hartmann ◽  
Bodil Jerslev ◽  
Claus Erik Schäffer ◽  
...  
Keyword(s):  
Long Range ◽  
Proton Spin ◽  
Coupling Constants ◽  
Spin Coupling ◽  
Proton Proton ◽  
Spin Coupling Constants

scholarly journals Long-range Proton-proton Spin Coupling Constants in Selenothiophenes.

1970 ◽  
Vol 24 ◽  
pp. 1953-1960 ◽  
Author(s):  
Andreas Bugge ◽  
Bo Gestblom ◽  
Ola Hartmann ◽  
Dagny Holme ◽  
Aud Lamvik ◽  
...  
Keyword(s):  
Long Range ◽  
Proton Spin ◽  
Coupling Constants ◽  
Spin Coupling ◽  
Proton Proton ◽  
Spin Coupling Constants

scholarly journals Signs of proton–proton and proton–fluorine spin–spin coupling constants in 2-fluoro-3-methylpyridine. Sigma and pi contributions to coupling in a nitrogen heterocycle

1969 ◽  
Vol 47 (9) ◽  
pp. 1507-1514 ◽  
Author(s):  
T. Schaefer ◽  
S. S. Danyluk ◽  
C. L. Bell
Keyword(s):  
Nitrogen Atom ◽  
Long Range ◽  
Coupling Constants ◽  
Spin Coupling ◽  
Nitrogen Heterocycle ◽  
Triple Resonance ◽  
Triple Resonance Experiments ◽  
Proton Proton ◽  
Spin Coupling Constants ◽  
Spin Spin Coupling

The signs of all proton–proton and proton–fluorine spin–spin coupling constants in 2-fluoro-3-methylpyridine have been determined by double and triple resonance experiments. The signs of the longrange coupling constants, JH,CH3 and JF,CH3 are the same as in fluorotoluene derivatives. Their magnitudes are consistent with the assumption that the nitrogen atom primarily polarizes the σ bonds in the molecule, leaving the π contribution to the long-range coupling relatively unaffected.

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