2.  Spectral Analysis of Diisopropylidenated Monosaccharides. Low Energy EI-MS Fragmentation Study

Authors: M.C. Pascariu, E. Sisu, V.L. Ordodi and L.M. Rusnac


Abstract:

Five diisopropylidenated monosaccharides, namely 1,2:5,6-di-O-isopropylidene-α-D-glucofuranose, 2,3:5,6-di- O-isopropylidene-α-D-mannofuranose, 1,2:3,4-di-O-isopropylidene-α-D-galactopyranose, 2,3:4,5-di-O-isopropylidene-β- D-fruc-topyranose and 2,3:4,6-di-O-isopropylidene-α-L-sorbofuranose, have been investigated using spectroscopic techniques. These include GC-EI-MS at multiple ionization energies, FTIR, DSC, TG, 1H and 13C NMR, and also DEPT135, COSY, HMQC and HMBC measurements. A high instability towards electronic ionization has been found for this type of compounds.


Keywords: monosaccharide, isopropylidene, acetonide, gas chromatography - mass spectrometry, nuclear magnetic resonance

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