Abstract
AbstractElectron ionization (EI), chemical ionization and mass‐analysed ion kinetic energy (MIKE) spectra have been applied with the aim of obtaining an unambiguous differentiation between the anomeric 2,3‐O‐isopropylidene α‐and β‐D‐ribofuranosyl azide derivatives. The MIKE spectra of their metastable [M CH3]+ ions, originating from EI, showed a decomposition pattern allowing distinction between the anomers. The origin of the ions in the EI mass spectra, supported by examination of the deuterium‐labelled derivatives, makes it possible to identify the actual azido group orientation in a particular anomer.
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