Separation of nuclear magnetic resonance signals of internally enantiotropic protons using a chiral shift reagent. Deuterium isotope effect on geminal proton-proton coupling constants

1972 ◽  
Vol 94 (9) ◽  
pp. 3253-3254 ◽  
Author(s):  
Robert R. Fraser ◽  
Michel A. Petit ◽  
Maurice Miskow
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Isotope Effect ◽  
Shift Reagent ◽  
Coupling Constants ◽  
Deuterium Isotope Effect ◽  
Proton Proton ◽  
Proton Coupling ◽  
Chiral Shift Reagent ◽  
Geminal Proton

The Relative Signs of the Nuclear Magnetic Resonance Proton-Proton Coupling Constants in Styrene Sulfide and Styrenimine1

1965 ◽  
Vol 87 (10) ◽  
pp. 2220-2225 ◽  
Author(s):  
Stanley L. Manatt ◽  
Daniel D. Elleman ◽  
Stanley J. Brois
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Coupling Constants ◽  
Proton Proton ◽  
Proton Coupling ◽  
Nuclear Magnetic

scholarly journals Carbon-13 nuclear magnetic resonance spectra of oxazoles

1979 ◽  
Vol 57 (23) ◽  
pp. 3168-3170 ◽  
Author(s):  
Henk Hiemstra ◽  
Hendrik A. Houwing ◽  
Okko Possel ◽  
Albert M. van Leusen
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Nmr Spectra ◽  
Chemical Shifts ◽  
Coupling Constants ◽  
Proton Coupling ◽  
Nuclear Magnetic Resonance Spectra ◽  
C Nmr ◽  
Magnetic Resonance Spectra ◽  
Nuclear Magnetic

The 13C nmr spectra of oxazole and eight mono- and disubstituted derivatives have been analyzed with regard to the chemical shifts and the various carbon–proton coupling constants of the ring carbons. The data of the parent oxazole are compared with thiazole and 1-methylimidazole.

Tritium labelling and tritium N.M.R. II. Labelled methyl (Z)-Octadec-9-enoate obtained by partial hydrogenation on Lindlar catalyst, and its reduction to(Z)-Octadec-9-en-1-ol

1982 ◽  
Vol 35 (8) ◽  
pp. 1615 ◽  
Author(s):  
AL Odell ◽  
KJ Ronaldson ◽  
RW Martin ◽  
DJ Calvert
Keyword(s):  
Chemical Shift ◽  
Finite Difference ◽  
Isotope Effect ◽  
Coupling Constants ◽  
Partial Hydrogenation ◽  
Double Bonds ◽  
Proton Proton ◽  
Proton Coupling ◽  
Lindlar Catalyst

The selectivity of tritium labelling of double bonds by partial hydrogenation of the acetylenic analogue on Lindlar catalyst is investigated by 3H and 13C n.m.r. Examples of both the secondary isotope effect on chemical shift and the usefulness of 3H n.m.r, measurements to calculate proton-proton coupling constants are described. In the absence of proton coupling a finite difference (0.014 ppm) in the chemical shift of tritons at positions 9 and 10 of methyl (Z)-[9,10-3H]octadec-9-enoate is observed.

Geminal Proton-Proton Coupling Constants in CH2[UNK]N-- Systems

1963 ◽  
Vol 85 (24) ◽  
pp. 4041-4042 ◽  
Author(s):  
B. L. Shapiro ◽  
S. J. Ebersole ◽  
G. J. Karabatsos ◽  
F. M. Vane ◽  
S. L. Manatt
Keyword(s):  
Coupling Constants ◽  
Proton Proton ◽  
Proton Coupling ◽  
Geminal Proton

Substituent effects on geminal proton–proton coupling constants

1970 ◽  
Vol 48 (13) ◽  
pp. 2134-2138 ◽  
Author(s):  
Y. L. Chow ◽  
S. Black ◽  
J. E. Blier ◽  
M. M. Tracey
Keyword(s):  
Carbon Tetrachloride ◽  
Chemical Shifts ◽  
Substituent Effects ◽  
Coupling Constants ◽  
Proton Proton ◽  
Proton Coupling ◽  
Geminal Proton ◽  
Geminal Coupling ◽  
Hammett Σ Constants

The geminal coupling constants between the non-equivalent benzylic protons of a series of para- and meta-substituted N-benzyl-2-methylpiperidines were shown to be proportional to the Hammett σ constants of the substituents with ρ −1.38 in carbon tetrachloride, −1.21 in benzene, and nearly 0 in 1 N DCl solutions. The ρ values were compared with those of other series and were discussed in terms of the possible conformations involved. The chemical shifts of the benzylic protons of the piperidine derivatives did not give a good correlation with the Hammett σ constants in these solvents.

A 1H and 13C nuclear magnetic resonance study of nucleosides with methylated pyrimidine bases

1982 ◽  
Vol 60 (24) ◽  
pp. 3026-3032 ◽  
Author(s):  
Frank E. Hruska ◽  
Wayne J. P. Blonski
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Chemical Shifts ◽  
Nuclear Magnetic Resonance Study ◽  
Coupling Constants ◽  
Magnetic Resonance Data ◽  
Proton Coupling ◽  
13C Nuclear Magnetic Resonance ◽  
Pyrimidine Bases ◽  
Nuclear Magnetic

Alkylated pyrimidine bases are of interest from the viewpoint of mutagenesis and carcinogenesis. 1H nuclear magnetic resonance data are presented for a series of ribosides and arabinosides alkylated at the O2,O4, N3, and C5 positions of the pyrimidine base. The data provide information about the stereochemical effects of base methylation. The J(5—6) proton coupling constants show that O-alkylation leads to a decrease in the π-bond order of the C5—C6 bond. The 13C chemical shifts are related to the tautomeric changes effected by O-alkylation.

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