Abstract
The analysis of a range of methyl ethers derived from methyl 7-deoxy- d- glycero-β- d- galacto-heptopyranoside ( 1) and methyl 7-deoxy- l- glycero-β- d- galacto-heptopyranoside ( 2) is examined in relation to their retention times in open-tubular gas—liquid chromatography, and to their electron-impact mass spectra and fragmentation patterns. In addition, the electron-impact and chemical-ionization mass spectra of the peracetylated and permethylated glycosides and alditol acetates of the novel 7-deoxyheptoses 1 and 2 are described. A fragmentation pattern for methyl 2,3,4,6-tetra- O-acetyl-7-deoxy- d- glycero-β- d- galacto-heptopyranoside was proposed, and verified by O-(trideuterioacetyl)ation.
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