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. Author manuscript; available in PMC: 2019 Jan 19.
Published in final edited form as: Chem Rev. 2018 Jun 22;118(14):6573–6655. doi: 10.1021/acs.chemrev.8b00031

Figure 1.

Figure 1.

The issue of reaction of triplet O2 with singlet (carbon) atoms (R). Two solutions are shown, one involving a metal complex M (usually Fe or Cu) and another with a π-stabilized radical (e.g., reduced flavin) that can react with O2. (The reactions are not intended to indicate stoichiometry.)