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. Author manuscript; available in PMC: 2020 Jul 27.
Published in final edited form as: Curr Opin Chem Biol. 2016 Jun 24;33:117–125. doi: 10.1016/j.cbpa.2016.05.022

Figure 2.

Figure 2

Probing the mechanism of cyanine photooxidation. (a) General reaction pathway. (b) Carbonyl products 8-11 resulting from regioselective formation and then cleavage of dioxetanes at the C2/C1′ and C2′/C3′ positions on the polyene. (c) Relative product mixture resulting from exposure of 7 to either 740 nm light or candidate ROS. Only 1O2 produces product ratios similar to those obtained with direct photolysis. (d) Energies of possible dioxetane intermediates en route to carbonyl products.