Ammonium cerium-nitrate → 5,12-Naphthacenedione, 1,2,3,4-tetrahydro-

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A solution of 36 mg (0.075 mmol) of the octahydro-11-naphthacenone and 60 mg (0.675 mmol) of NaHCP3 in 10 mL of acetone was treated with a solution of 167 mg (3mmol) of cerium ammonium nitrate (CAN) and 1 mg of dichlorodicyanobenzoquinone (DDQ) in 2 mL of acetone added in one portion at 0 degrees centigrade. The reaction mixture was stirred at room temperature for 1.5 hours during which the color changed from shiny yellow to orange red, and then 25 mL of CH2Cl2 was added. The mixture was filtered through over Celite. The organic layer was washed with saturated NaCl solution (2×20 mL), dried over Na2SO4, and evaporated to give the tetrahydro-5,12-naphthacenedione as a red crystals (29 mg, 86 percent).mp greater than 258 degrees centigrade (decomp).

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