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Identification of methyl O-acetyl-O-trifluoroacetyl-β-D-xylopyranosides by gas chromatography and mass spectrometry

V. Mihálov, E. Petráková, and V. Kováčik

Institute of Chemistry, Centre for Chemical Research, Slovak Academy of Sciences, CS-84238 Bratislava

 

Abstract: Of all theoretically possible positional isomers of methyl O-acetyl-β-D-xylopyranosides, trifluoroacetyl derivatives have been prepared and studied by combination of electron impact mass spectrometry and gas chromato­graphy. All positional isomers are separated on an OV-225 column. The positions of acetyl groups in mono-O-acetyl derivatives may be established unambiguously from the intensities of peaks with m/z 182, 225, and 278. The mass spectra of di-0-acetyl derivatives differ from each other only negli­gibly. Therefore, in characterization of these derivatives the retention times relative to fully acetylated methyl  β-D-xylopyranoside (RRT) have to be considered.

Full paper in Portable Document Format: 435a685.pdf

 

Chemical Papers 43 (5) 685–691 (1989)

Monday, August 08, 2022

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