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. Author manuscript; available in PMC: 2019 Jul 2.
Published in final edited form as: Tetrahedron. 2019 Jan 12;75(9):1115–1121. doi: 10.1016/j.tet.2019.01.008

Figure 1.

Figure 1.

Catalytically active species of flavin (flavin-adenine dinucleotide and flavin mononucleotide) referenced in this review. (A) Flox can act as a one or two electron acceptor to afford the semiquinone or reduced flavin (Flred). (B) Flred in the context of ene-reductases can perform the two-electron reduction of activated olefins. Flred may also react with molecular oxygen to form the C4a-peroxy (D) or hydroperoxy flavin (E) which can be the source of an oxygen atom for incorporation into organic substrates. Elimination of peroxide affords Flox..