Deceptive simplicity in ABMX N.M.R. spectra. III. The spectrum of benzothiophen

1972 ◽  
Vol 25 (2) ◽  
pp. 327 ◽  
Author(s):  
F Balkau ◽  
ML Heffernan
Keyword(s):  
High Resolution ◽  
Strong Coupling ◽  
Long Range ◽  
Coupling Constants ◽  
High Resolution Spectrum ◽  
Very High

The analysis of the high resolution spectrum of benzothiophen in several solvents is reported. It is noted that the conditions are close to those leading to deceptively simple spectra, but under very high resolution sufficient lines could be resolved to give an unambiguous analysis. The inter-ring, long-range coupling constants, as well as their relative signs, could be determined from these spectra as a result of the strong coupling between protons.

High resolution spectrum of NO2 loosely bound states: densities of states and long range forces

2001 ◽  
Vol 3 (12) ◽  
pp. 2268-2274 ◽  
Author(s):  
Sylvain Heilliette ◽  
Antoine Delon ◽  
Patrick Dupre´ ◽  
Re´my Jost
Keyword(s):  
High Resolution ◽  
Long Range ◽  
Bound States ◽  
High Resolution Spectrum ◽  
Densities Of States

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.

Proton magnetic resonance studies of non-alternant hydrocarbons. I. Some comments on the aromatic character of the fulvenes

1966 ◽  
Vol 19 (10) ◽  
pp. 1813 ◽  
Author(s):  
ML Heffernan ◽  
AJ Jones
Keyword(s):  
Magnetic Resonance ◽  
High Resolution ◽  
Long Range ◽  
Proton Magnetic Resonance ◽  
Coupling Constants ◽  
Magnetic Resonance Studies ◽  
Aromatic Character ◽  
Alternant Hydrocarbons ◽  
Cyclic Dienes ◽  
Magnetic Resonance Spectra

The high-resolution proton magnetic resonance spectra of 6- phenylfulvene, 6-methyl-6-phenylfulvene, and 6-dimethylaminofulvene have been studied in detail. The aromatic character of the fulvenes is discussed in terms of the derived parameters, and observations, in general, indicate that these compounds should be regarded as cyclic dienes. Long-range coupling constants involving protons separated by five and six bonds have been observed.

High-Resolutjon nuclear-magnetic-resonance spectra of hydrocarbon groupings VI. The hydrogen spectra of carbon-13 substituted ethane, ethylene and acetylene

1962 ◽  
Vol 269 (1338) ◽  
pp. 385-403 ◽  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
High Resolution ◽  
Long Range ◽  
Experimental Results ◽  
Coupling Constants ◽  
Nuclear Magnetic Resonance Spectra ◽  
Magnetic Resonance Spectra ◽  
Nuclear Magnetic

High-resolution spectra have been obtained from the hydrogen nuclei of appropriate isotopic mixtures of ethane, ethylene and acetylene containing one or two magnetic 13 C nuclei. Analysis of these spectra has yielded the magnitudes of all but one of the possible inter - nuclear coupling constants in these molecules, including those between pairs of carbon nuclei. Where a given molecule has several coupling constants between pairs of the same type of nuclei the relative signs of these have also been determined. Discussion of the experimental results in terms of current theoretical treatments shows that in nearly all cases the contact, H 3 , term is the most important one in determining the magnitude of the coupling constants. Only in the case of the J CC and the long-range J ' CH coupling constants of acetylene does it appear to be necessary to consider appreciable contributions from other terms.

Long-range coupling in substituted coumarins

1968 ◽  
Vol 21 (10) ◽  
pp. 2445 ◽  
Author(s):  
MW Jarvis ◽  
AG Moritz
Keyword(s):  
Magnetic Resonance ◽  
High Resolution ◽  
Long Range ◽  
Proton Magnetic Resonance ◽  
Very High ◽  
Substituted Coumarins ◽  
Magnetic Resonance Spectra

The proton magnetic resonance spectra of some substituted coumarins and furanocoumarins have been examined under very high resolution (0.1 Hz). Trans-annular long-range spin-spin couplings across four, five, six, and seven bonds are reported.

scholarly journals Variation of the fine-structure constant: very high resolution spectrum of QSO HE 0515-4414

2006 ◽  
Vol 451 (1) ◽  
pp. 45-56 ◽  
Author(s):  
H. Chand ◽  
R. Srianand ◽  
P. Petitjean ◽  
B. Aracil ◽  
R. Quast ◽  
...  
Keyword(s):  
Fine Structure ◽  
High Resolution ◽  
Structure Constant ◽  
Fine Structure Constant ◽  
High Resolution Spectrum ◽  
Very High

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.

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