This is a follow-up to the question here. There is no mono-anionic stage shown, does it "disproportionate" to the neutral molecule and the di-anion?

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    $\begingroup$ It just means second pKa is not significantly higher then first. $\endgroup$ – Mithoron May 4 '18 at 22:49
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    $\begingroup$ So maybe when we form the mono-anion the conjugation of the two phenolic rings favors driving the next proton off to form a highly stabilized "quinone-aromatic" structure, thus lowering that pKa? $\endgroup$ – Oscar Lanzi May 5 '18 at 0:55

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