This chain reaction is initiated by reaction 0, which is assumed to be quite slow under near-neutral conditions because spin-restricted. However, once a small amount of Q •-is produced, it is able to trigger a cascade of faster reactions, notably reactions 1, 2 and 5 (forming a set of propagation reactions), which results in an autoinductive acceleration of the oxidation of 1,4-NQ by O2. Through this reaction network, QH2 and O2 are consumed by reactions 1, 3 and 2, respectively, while Q is produced in oxidation reactions 2 and 5. This reaction scheme predicts a 1:1 stoichiometry for the autoxidation of QH2, leading thus to a 1:1 production of Q and H2O2. The rate acceleration of this mechanism originates from the product Q, which is the catalyst of its own formation through the comproportionation reaction 1. The majority of these reactions are pH-dependent but, for sake of simplicity, the rate constants used in this work are those at an effective pH (here pH 8.5). The rate constant values we have used are gathered in Table . Most of them were retrieved from the literature. A few were corrected for pH, while others were adjusted to fit the experimental data (see SI for a detailed description of the rate constant selection).