Electron ionization mass spectra of organophosphorus compounds Part V: Mass fragmentation modes of some azolyl, azinyl, and azepinyl phosphonates as cyclic -aminophosphonates

Abstract

Mass fragmentation pathways of eight synthetic organophosphorus compounds, belonging to azolyl, azinyl, and azepinyl phosphonates as cyclic α-aminophosphonates 1a,b–4a,b were investigated by electron impact mass spectrometry with the aim of obtaining a better understanding of their fragmentation processes. The intensity of the recorded molecular ion peaks showed moderate values. Compounds 1a,b–3a,b have almost identical fragmentation routes via easy elimination of phosphonate groups which can be fragmented into the cation PO2as base peaks. On the contrary, compounds 4a,b started their fragmentation via removal of 4-chlorophenyl moieties.