Fuming sulfuric acid → 2,7-Di-t-butylanthraquinone

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4-t-Butyl-2-benzoylbenzoic acid 4 (32.0 g, 95 mmol) was placed into a round-bottom flask and oleum (30%, 290 mL) was then added. The reaction mixture turned black and the reaction temperature was increased to 120° C. and stirred for 3 h. The mixture was then poured into ice. The aqueous mixture was extracted using CH2Cl2 (5×), dried over Na2SO4 and concentrated to give a dark solid. This solid was passed through a silica gel column using CH2Cl2 as eluent. After concentrating, the yellow-brown solid was recrystallized from hexane to give product as yellow crystals 21.0 g (69% yield). 1H NMR (CDCl3) δ(ppm): 1.42 (s, 18H), 7.80 (d, J=8.2 Hz, 1H), 7.81 (d, J=8.2 Hz), 8.20 (d, J=8.2 Hz, 1H),), 8.22 (d, J=8.2 Hz, 1H), 8.31 (s, 2H); 13C NMR (CDCl3): 31.01, 35.58, 123.83, 123.90, 127.17, 127.28, 131.08, 131.15, 131.34, 131.42, 133.40, 133.49, 157.94, 158.05, 182.76, 183.28,183.78

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