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Caption : fig. s1 preparation of 2, 6-di-tert-butylanthracene by alkylation of anthracene.

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Caption : fig. s2 preparation of 2, 6-di-tert-butylanthraquinone by oxidation of 2, 6-di-tert-butylanthracene.

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Caption : fig. s3 the effect of reaction time on h2o2 concentration in dbaq system under intermittent conditions.

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Caption : fig. s4 the hrms spectrum of the intermittent ⅰ adduction with tempo in the photocatalytic process. hrms (m/z): (esi) calcd. for c12h26no2+ [m + h]+: 216.1958, found: 216.19576. 

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Caption : fig. s5 epr test of the photocatalytic system to detect the generation of superoxide radical anion (o₂⁻·) under the irradiation.

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Caption : fig. s6 detailed settings of the dft calculation.