Changes to the electronic absorption of A) 52 μM of 4 in a 1% DMSO aqueous solution at irradiation times of 0, 2, 3, 4, 5, 6, 7, 8, 10, and 15 min (λirr ≥ 395 nm); inset: 0, and 1 min; and B) 51 μM of 5 in a 2 % acetone aqueous solution at irradiation times of 0, 10, 13, 16, 20, 25, 30, 40, 50 and 60 min (λirr ≥ 395 nm); inset: 0, 1, 2, 3, 5, and 7 min. * denotes the absorption maximum of the intermediate.