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. 2021 May 20;13(10):1670. doi: 10.3390/polym13101670

Figure 2.

Figure 2

The comproportionation reaction. Two monomers/moieties of different oxidative states react to yield an intermediate oxidative state (the semiquinone). This figure was adapted from Chemical Physics, 546, A.B. Mostert, On the free radical redox chemistry of 5,6-dihydroxyindole, 111158, Copyright Elsevier (2021) [17].