The mass spectra of small-ring heterocycles. IV

Both the high and low resolution mass spectra of fourteen isomeric trans- and cis-aroylaziridines are presented. In contrast to earlier low resolution mass spectral work on these compounds 1], a new fragmentation pathway for the loss of hydroxyl is presented. Also, the simple fission of the N-alkylnitrogen bond is described. Detailed fragmentation mechanisms are presented and discussed for the major ions found in the mass spectra.