The photoinduced rearrangements of oxaziridines continue to command attention because of the successful utilization of this chemistry in synthesis.* We recently reported on the arylsensitized photoisomerization of N-alkyl spiro oxaziridines to lactams, as exemplified by the toluene-sensitized transformation of 2-isobutyl-1, 2-oxazaspiro [2.5] octane (1) to the ring- expanded lactam, 2 (eq l). 3 Because of the apparently endothermic nature solvent
