Electron impact mass spectrometry of phenyl thiophosphoroorganic amides

The interpretation of the electron impact mass spectra of methyl phenyl phosphinomorpholinylamidothioate, O-methyl phenyl phosphonomorpholinylamidothioate, phenyl phosphonomorpholinylamidochloridothioate and O-ethyl phenyl phosphonomorpholinyhimidothioate is presented. Elucidation of the fragmentation pathways was aided by exact mass measurements and observation of peaks due to metastable transitions detected for the first and last of the above compounds.