Mass Spectrometry of Mecarbam and of Some Relatedo,o-Dialkyls-(N-Ethoxycarbonyl-N-Methylcarbamoylmethyl) Ands-Methylcarbamoylmethyl Phosphorodithioates and Phosphorothioates

The electron impact positive ion mass spectra of mecarbam and of a range of related phosphorodithioates and phosphorothioates containing substituted carbamoylmethyl groups are reported. All compounds exhibit molecular ion peaks and show fragmentation patterns which are characteristic of both the organophosphate and carbamoyl moieties. An unusual rearrangement involving phosphorus-sulphur fission and the apparent transfer of hydroxyl from the carbamoyl chain to phosphorus is discussed.