Analyses of the complex proton NMR spectra: Determination of anisotropic proton chemical shifts of oriented molecules by a two dimensional experiment

2007 ◽  
Vol 185 (2) ◽  
pp. 240-246 ◽  
Author(s):  
Raghav G. Mavinkurve ◽  
H.S. Vinay Deepak ◽  
K.V. Ramanathan ◽  
N. Suryaprakash
Keyword(s):  
Nmr Spectra ◽  
Chemical Shifts ◽  
Proton Nmr ◽  
Two Dimensional ◽  
Oriented Molecules ◽  
Proton Chemical Shifts

Chemical shift correlated two-dimensional nmr spectroscopy and its application to solving the proton nmr spectra of oligoribonucleotides

1980 ◽  
Vol 58 (18) ◽  
pp. 1947-1956 ◽  
Author(s):  
Alex D. Bain ◽  
Russell A. Bell ◽  
Jeremy R. Everett ◽  
Donald W. Hughes
Keyword(s):  
Nmr Spectroscopy ◽  
Chemical Shift ◽  
Nmr Spectra ◽  
Pulse Sequence ◽  
Chemical Shifts ◽  
Proton Nmr ◽  
Two Dimensional

An alternative two-dimensional nmr pulse sequence, (90°–t1/2–90°–t1/2–FID),correlates the chemical shifts of coupled nuclei. The application of this technique to the solution of the complicated proton nmr spectra of oligoribonucleotides is discussed.

13C MAS NMR and 1H-29Si and 1H-13C heteronuclear correlation study of model xylooligosaccharides

1987 ◽  
Vol 52 (10) ◽  
pp. 2460-2473 ◽  
Author(s):  
Jan Schraml ◽  
Eva Petráková ◽  
Ján Hirsch ◽  
Jan Čermák ◽  
Václav Chvalovský ◽  
...  
Keyword(s):  
Nmr Spectra ◽  
Chemical Shifts ◽  
Parent Compound ◽  
Correlation Study ◽  
Mas Nmr ◽  
Positional Isomers ◽  
Two Dimensional ◽  
Oh Groups ◽  
Heteronuclear Correlation

Anomer structures of crystalline D-xylopyranose, all positional isomers of β-D-xylopyranosyl-D-xylopyranose and 2,4-di-β-D-xylopyranosyl-D-xylopyranose were determined by 13C MAS NMR spectroscopy. The saccharides were pertrimethylsilylated by different methods yielding different ratios of pertrimethylsilylated anomers. The NMR spectra (1H, 13C, and 29Si) were assigned by two-dimensional chemical shift correlations. In the anomeric mixtures complete overlap in parts of proton spectra is frequent. In such a case, samples with different anomer ratios considerably facilitate assignment of both 13C and 29Si NMR lines. In analytical applications, however, that method of trimethylsilylation must be chosen which does not allow anomerization prior to silylation. 29Si NMR spectra furnish correct number of OH groups present in the parent compound prior to silylation. Assigned silicon chemical shifts can be used for determination of the sites of glycosidation in oligosaccharides. Glycosidic carbon atoms are considerably shielded after pertrimethylsilylation.

17O NMR spectra of the 1,6-anhydro-β-D-hexopyranoses and related-compounds. Determination of configurational effects on the chemical shifts

1992 ◽  
Vol 30 (4) ◽  
pp. 312-319 ◽  
Author(s):  
Jürgen Lauterwein ◽  
Jürgen Schulte ◽  
Martin Schumacher ◽  
Miloslav Černý
Keyword(s):  
Nmr Spectra ◽  
Chemical Shifts ◽  
17O Nmr ◽  
Related Compounds

1H Chemical Shifts of Protons Directly Bonded to Phosphorus

1970 ◽  
Vol 25 (5) ◽  
pp. 451-461 ◽  
Author(s):  
Doureid Houalla ◽  
Raymond Marty ◽  
Robert Wolf
Keyword(s):  
Chemical Shifts ◽  
Proton Chemical Shifts

Over 100 δH values of H- (P) obtained in our laboratory, as well as values from the literature, have been tabulated and discussed. These data are useful, not only in the study of molecules containing a P-H bond but also, more generally, in the determination of the factors which influence the value of proton chemical shifts.

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