The mass spectra of Schiff bases. I. Simple fissions and rearrangements

Under electron impact, Schiff bases give a stable molecular ion which undergoes simple fission at the ring-nitrogen and ring-carbon bonds. Ortho substitution leads to ions derived from five-membered heterocycles. Derivatives of o-methoxy-benzaldehyde exhibit a two-hydrogen transfer with fission of the azomethine double bond to give the amine radical-ion.