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In the presence of two molar equiv. of B(C₆F₅)₃p-benzoquinone reacts with persistent radicals TEMPO, trityl or decamethylferrocene by single electron transfer to give the doubly O-borylated benzosemiquinone radical anion with TEMPO⁺, trityl cation or ferrocenium counter cations.
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Tao et al. (2018) studied this question.
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