| Abstract: | Nine tri- and five tetramethyl ethers have been obtained by the partial methylation of methyl α- and β-glucoheptopyranosides and methyl 2,3,4,6,7-penta-O-acetyl1-α- and-β-glucoheptopyranosides. The retention indices of both types of methyl ethers on the liquid phase NPGS have been measured and the main directions of the fragmentation of these compounds under electron impact have been determined. The laws of the mass spectra of the position isomers that have been found will permit their use in GLC-MS analysis for determining the structure of a polysaccharide by the methylation method. |
