Sucrose nuclear magnetic resonance spectra

Fig. 8.—The Partial, H Nuclear Magnetic Resonance Spectrum of Sucrose Octaacetate (8) in Solution in Acetone-rid, With a Diagrammatic Representation of the First-order Assignment of the n-Glucose Protons is Shown in A. [The set of INDOR traces (B, C, D, and E) was obtained by sequentially monitoring transitions 1, 8, 5, and 3.]...

Figure 5. Partial carbon-13 nuclear magnetic resonance spectrum of sucrose monopalmitate in methyl sulfoxide-, pulse time was 3 sec with a total of 32,000 pulses...

The structures of vanicosides A (1) and B (2) and hydropiperoside (3) were established primarily by one- and two-dimensional nuclear magnetic resonance (NMR) spectroscopy techniques and fast atom bombardment (FAB) mass spectrometry (MS).22 The presence of two different types of phenylpropanoid esters in 1 and 2 was established first through the proton (4H) NMR spectra which showed resonances for two different aromatic substitution patterns in the spectrum of each compound. Integration of the aromatic region defined these as three symmetrically substituted phenyl rings, due to three p-coumaryl moieties, and one 1,3,4-trisubstituted phenyl ring, due to a feruloyl ester. The presence of a sucrose backbone was established by two series of coupled protons between 3.2 and 5.7 ppm in the HNMR spectra, particularly the characteristic C-l (anomeric) and C-3 proton doublets... 

Figure 3.26 Homonuclear decoupling experiments of the 300 MHz proton NMR spectrum of sucrose dissolved in DjO. The fully coupled spectrum is shown in (c). (a) Selective saturation of the triplet at 4.05 ppm collapses the doublet at 4.22 ppm, showing the coupling between the positions of protons a and b marked on the sucrose structure, (b) Saturation of the doublet at 5.41 ppm collapses the doublet of doublets. The experiment shows the coupling between the protons marked c and d on the structure. (The spectra are from Petersheim, M., Nuclear magnetic resonance, in Ewing, G.A., ed.. Analytical Instrumentation Handbook, 2nd edn., Marcel Dekker Inc., New York, 1997. Used with permission. The sucrose structure is that of D-(-r)-sucrose, obtained from the SDBS database, courtesy of the National Institute of Industrial Science and Technology, Japan, http //www.aist.go.jp/RICBD/SDBS. Accessed on May 11, 2002.)...

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