occurs at 100 mV:
:

The semiquinone radical can be reduced to the catecholate dianion, the potential being dependent on pH:
:

Catechol is produced by a reversible two-electron, two-proton reduction of 1,2-benzoquinone (1=''E''{{sup = +795 mV}} vs SHE; 1=''E''{{sub (at pH 7) = +380 mV}} vs SHE).

The redox series catecholate dianion,

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