Research Article
Mass Spectrometry of Bis-Quinolizidine Alkaloids: FAB-MS of Oxo-Substituted Sparteines
Table 1
Relative abundances of characteristic ions in the FAB mass spectra of 1– 7.
| | | Elemental | % Relative abundance | Ion | m/z | composition | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| M+H⌉ + a | 249 | C15H24N2O+H | 50 | 100 | 100 | — | — | — | — | 263 | C15H22N2O2+H | — | — | — | 100 | 100 | — | — | 265 | C15H24N2O2+H | — | — | — | — | — | 100 | 25 | M+H-CO⌉ + b | 221 | C14H24N2+H | — | — | 8 | — | — | — | — | M+H- H2O⌉ + c | 245 | C15H20N2O+H | — | — | — | — | 10 | — | — | 247 | C15H22N2O+H | | | | | | 8 | 100 | d | 138 | C9H15N+H | 57 | 28 | 7 | — | — | — | — | | 151 | C9H12NO+H | — | — | — | 10 | 6 | 3 | 8 | e | 154 | NBA+H | 100 | 46 | 9 | 84 | 55 | 58 | 12 |
| f | 136 | [NBA+H]-H2O | 62 | 35 | 15 | 54 | 34 | 39 | 18 |
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NBA: C7H7O3N.
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