Results 161 to 170 of about 489,673 (196)
Some of the next articles are maybe not open access.
1986
The chemical shift range of carbon-13 resonances is so wide (more than 200 ppm for simple functional classes) that most compounds show a separate signal for each different carbon environment in the molecule; this is dramatically illustrated in the spectrum for vitamin B12 at the head of the chapter, and more modestly in the menthol spectrum in figure 5.
openaire +1 more source
The chemical shift range of carbon-13 resonances is so wide (more than 200 ppm for simple functional classes) that most compounds show a separate signal for each different carbon environment in the molecule; this is dramatically illustrated in the spectrum for vitamin B12 at the head of the chapter, and more modestly in the menthol spectrum in figure 5.
openaire +1 more source
Mass Spectra and NMR Spectra of Gangliosides Containing Fucose
1980Two gangliosides containing fucose, prepared from minipig posterior root ganglion, were analyzed as methylated, methylated-reduced and methylated-reduced-trimethylsilylated derivatives by mass spectrometry and NMR spectroscopy and shown to have the following structures:Fuc alpha 1 leads to Hex beta 1 leads to 3HexNac (comes from NeuAc) beta 1 leads to ...
openaire +2 more sources
17O NMR spectra of alpha-diesters.
Magnetic resonance in chemistry : MRC, 200617O NMR spectra of title compounds were measured at natural abundance in acetonitrile solutions. Intercarbonyl dihedral angles have been estimated by molecular mechanics, which show invariance except in one case. Because of this invariance, contrary to other alpha-dicarbonyl compounds, a correlation between chemical shifts and dihedral intercarbonyl ...
CERIONI, GIOVANNI, G. UCCHEDDU
openaire +2 more sources
1986
Oxygen has a paradoxical position in analytical chemistry: it is present in many classes of compound, yet few methods can detect its presence directly (rather than by inference or difference). Its position in NMR analysis is also difficult, because the only naturally occurring magnetic isotope is 17O, with an abundance of 0.037% and an over all ...
openaire +1 more source
Oxygen has a paradoxical position in analytical chemistry: it is present in many classes of compound, yet few methods can detect its presence directly (rather than by inference or difference). Its position in NMR analysis is also difficult, because the only naturally occurring magnetic isotope is 17O, with an abundance of 0.037% and an over all ...
openaire +1 more source
Software: Simulating NMR spectra
Analytical Chemistry, 1997Dallas L. Rabenstein, Andreas Kaerner
openaire +1 more source
Implicit Solvation Models: Equilibria, Structure, Spectra, and Dynamics
Chemical Reviews, 1999Christopher Cramer, Donald G Truhlar
exaly