[OH:1][N:2]1[C:7]([CH3:9])([CH3:8])[CH2:6][CH:5]([O:10][C:11](=[O:18])[C:12]2[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=2)[CH2:4][C:3]1([CH3:20])[CH3:19].C(#N)C.[CH2:24]1[CH2:29][CH2:28][CH2:27][CH2:26][CH2:25]1.OO>O>[CH:24]1([O:1][N:2]2[C:7]([CH3:9])([CH3:8])[CH2:6][CH:5]([O:10][C:11](=[O:18])[C:12]3[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=3)[CH2:4][C:3]2([CH3:20])[CH3:19])[CH2:29][CH2:28][CH2:27][CH2:26][CH2:25]1A solution of 0.097 g (0.359 mmol) of ferric chloride hexahydrate in 2 ml of water is added to a mixture of 5.00 g (18.1 mmol) of 1-oxyl-4-benzoyloxy-2,2,6,6-tetramethylpiperidine, 28 ml of acetonitrile, and 19 ml of cyclohexane. The mixture is heated to 56° C. A solution of 4.70 g (69 mmol) of 50% aqueous hydrogen peroxide is added dropwise over 2.25 hours to the reaction mixture while the temperature is brought to and maintained at reflux. After the peroxide is added, the mixture is heated at reflux for 45 minutes. Work-up and purification according to the procedure of Example 5 afford 5.47 g (84% yield) of the title compound, a pale yellow syrup. GC assay is 100%.
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