The mass spectra of acetylated and propanoylated aldofuranosylamines

The mass spectra of six N-acetylaldofuranosylamine acetates and propanoates were recorded. The spectra are more complicated than those of the corresponding pyranoid compounds. As in that case, the spectra are rich in long-lived fragments, in agreement with the stabilizing influence of the nitrogen atom on the positive charge. Several fragmentation series are similar to those of the aldopyranosylamine derivatives, and others agree better with those of the aldofuranose acetates, thus allowing identification of the furanoid ring.