Nuclear magnetic resonance studies of long-range carbon-13 spin couplings

1972 ◽  
Vol 94 (16) ◽  
pp. 5896-5897 ◽  
Author(s):  
F. R. Jerome ◽  
K. L. Servis
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Long Range ◽  
Magnetic Resonance Studies ◽  
Nuclear Magnetic

Nuclear magnetic resonance studies of long-range fluorine spin couplings

1971 ◽  
Vol 93 (6) ◽  
pp. 1535-1537 ◽  
Author(s):  
Kenneth L. Servis ◽  
Frederick R. Jerome
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Long Range ◽  
Magnetic Resonance Studies ◽  
Nuclear Magnetic

Nuclear Magnetic Resonance Studies. XXIII. Long-range 1H–1H Couplings (JHCCOCH) in some Methyl Bicyclo[2.2.1]heptane-2-carboxylates

1971 ◽  
Vol 49 (12) ◽  
pp. 2152-2155 ◽  
Author(s):  
H. Brouwer ◽  
J. B. Stothers
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Long Range ◽  
Coupling Constants ◽  
Magnetic Resonance Studies ◽  
Nuclear Magnetic

The methoxyl proton signals of several 3-substituted 2-carbomethoxybicyclo[2.2.1]hept-5-enes and -heptanes appear as doublets because of 1H–1H coupling over five σ-bonds (5J). The dependence of these long-range coupling constants on the nature and orientation of 2- and 3- substituents is discussed in terms of the probable conformations of the 2-carbomethoxyl groups.

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.

Nuclear magnetic resonance studies. XVIII.The proton parameters of some bicyclo[2•2•2]octane derivatives

1969 ◽  
Vol 47 (19) ◽  
pp. 3515-3528 ◽  
Author(s):  
Gurudata Gurudata ◽  
J. B. Stothers
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
High Resolution ◽  
Long Range ◽  
Coupling Constants ◽  
Magnetic Resonance Studies ◽  
Anisotropic Effect ◽  
Shielding Effects ◽  
Nuclear Magnetic

The high resolution proton spectra of ten substituted bicyclo[2•2•2]octenes and octanes have been analyzed. The proton shieldings and coupling constants are discussed with particular emphasis on the stereochemical dependence of these parameters. Evidence bearing on the anisotropic effect of carbonyl bonds is presented to substantiate other recent findings on these shielding effects. Certain long-range couplings permit stereochemical assignments.

Nuclear magnetic resonance studies on sequence distributions in vinyl alcohol-vinyl acetate copolymers

Polymer ◽  
1983 ◽  
Vol 24 (5) ◽  
pp. 507-512 ◽  
Author(s):  
S TOPPET ◽  
P LEMSTRA ◽  
G VANDERVELDEN
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Vinyl Acetate ◽  
Vinyl Alcohol ◽  
Magnetic Resonance Studies ◽  
Sequence Distributions ◽  
Nuclear Magnetic
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