were also calculated for comparison. As shown in Fig. , the control compounds all had the expected bond angles. For example, cyclobutane (in which each carbon atom would be assigned the sp 3 -hybridization state) had calculated H-C-H bond angles of 109°, while cyclopropane (the prototypical sp hybridized structure) had calculated H-C-H bond angles of 115°. Both values are consistent with literature reports. As expected, the saturated diaziridine molecule also had an H-C-H bond angle of close to 115°, suggesting that it too can be described as sp -hybridized, similar to cyclopropane or cyclopropene. Remarkably, however, the calculated H-C-H bond angle for the parent diazirine molecule-as well as the calculated CF3-C-aryl bond angle for trifluoromethyl phenyl diazirine-were both approximately 120°. This observation strongly supports the description of the central carbon as being sp 2 -hybridized.