Calculated stationary points on the triplet surface of 1. The energies of the S1 (63), T1 (49), and T2 (54) of 1 were obtained from the TD-DFT calculations, whereas the energies of S0 (0), T1 (46), TS (48), and triplet vinyl nitrene 2 were obtained by optimization calculations. Energies are in kcal/mol.