Solvent Effects on Geminal H–H Couplings: A New Method for Determining Signs of Coupling Constants

1966 ◽  
Vol 45 (8) ◽  
pp. 2848-2855 ◽  
Author(s):  
Stanford L. Smith ◽  
Richard H. Cox
Keyword(s):  
Solvent Effects ◽  
Coupling Constants ◽  
New Method

scholarly journals Solvent Effects on the Indirect Spin–Spin Coupling Constants of Benzene: The DFT-PCM Approach

2003 ◽  
Vol 4 (3) ◽  
pp. 119-134 ◽  
Author(s):  
Kenneth Ruud ◽  
Luca Frediani ◽  
Roberto Cammi ◽  
Benedetta Mennucci
Keyword(s):  
Solvent Effects ◽  
Coupling Constants ◽  
Spin Coupling ◽  
Spin Coupling Constants ◽  
Spin Spin Coupling

SOLVENT EFFECTS AS AN AID IN THE ANALYSIS OF THE PROTON MAGNETIC RESONANCE SPECTRUM OF VINYL BROMIDE

1960 ◽  
Vol 38 (11) ◽  
pp. 2066-2073 ◽  
Author(s):  
T. Schaefer ◽  
W. G. Schneider
Keyword(s):  
Chemical Shift ◽  
Solvent Effects ◽  
Resonance Spectrum ◽  
Proton Magnetic Resonance Spectrum ◽  
Coupling Constants ◽  
Vinyl Bromide ◽  
Proton Coupling ◽  
Geminal Proton ◽  
Geminal Coupling ◽  
Cis And Trans

By making use of specific solvent effects it has been possible to vary the relative chemical shift between the geminal protons of vinyl bromide from about +10 cycles/sec to −4 cycles/sec (at 60 Mc/sec) and to study the resultant changes in the proton resonance spectrum in the limiting region of zero chemical shift. Of particular interest is the growth and displacement of the combination lines, which appear in the resonance signals of the proton bonded to the same carbon atom as the bromine. From the variation of the six possible lines in this region it was confirmed that the cis and trans proton coupling constants must have the same sign. The intensity distribution of the lines in the geminal proton region require the geminal coupling constant to be of opposite sign to the other two.

The N.M.R. spectra of some tricyclic heterocycles related to phenothiazine

1971 ◽  
Vol 24 (2) ◽  
pp. 325 ◽  
Author(s):  
IC Calder ◽  
RB Johns ◽  
JM Desmarchelier
Keyword(s):  
High Resolution ◽  
Long Range ◽  
Solvent Effects ◽  
Substituent Effects ◽  
Coupling Constants

The high-resolution N.M.R. spectra of ten tricyclic heterocycles related to phenothiazine in which the heteroatoms are combinations of O, N, S, Se, Te, and As are reported. The coupling constants are discussed in terms of substituent effects for the heteroatoms. Long- range coupling of the NH and solvent effects are used to make assignments of the protons.

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