Mass Spectrometry of Bis-quinolizidine Alkaloids: Unexpected Dimerization in Electron Ionization Mass Spectrometry

摘要

The electron-ionization mass spectra of dimers of bis-quinolizidine alkaloids: α-isosparteine, 2-methylsparteine, 17-hydroxylupanine, lupanine N-oxide and 2,17-dimethylsparteine are discussed and general fragmentation routes of their molecular cations are