 Enantiopure oxaziridines where stereochemistry is entirely due to configurationally stable nitrogen are reported.In the late 1970s and early 1980s Franklin A. Davis synthesized the first "N"-sulfonyloxaziridines, which act exclusively as oxygen transfer reagents, and are the most predominantly used class of oxaziridines today.While originally synthesized with mCPBA and the phase transfer catalyst benzyltrimethylammonium chloride, an improved synthesis using oxone as the oxidant is now most prevalent.