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    Photochemistry and Radiation Chemistry of 9,10-Anthraquinone-2-sodium Sulphonate in Aqueous Solution: Part 2.—Photochemical Products 1
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1972, 68 (9), 1972) Clark, K. P.; Stonehill, H. I.
    Anthraquinone-2-sodium sulphonate in “aqueous” solutions within the range pH 14 to 100% H2SO4(and also in oleum) is both reduced and hydroxylated when irradiated with u.v. or visible light. The major hydroxy-photoproducts were isolated and identified as a 3 : 2 mixture of isomeric α-and β-hydroxy derivatives of the starting material in the range 40 % H2SO4 to pH 9; outside this region the relative amount of α isomer produced falls off rapidly and in strong acid or alkali only the β-hydroxy product is obtained. Prolonged irradiation produces also small amounts of polyhydroxy derivatives. The pH-dependence of the ratio of α- and β-hydroxy product yields is correlated with ionization of hydroxyl radical adduct intermediates.