[CH2:1]([CH:8]1[CH:13]([OH:14])[CH2:12][C:11]([CH3:16])([CH3:15])[NH:10][C:9]1([CH3:18])[CH3:17])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[CH2:19]=O.[OH-].[Na+]>O1CCOCC1>[CH2:1]([CH:8]1[CH:13]([OH:14])[CH2:12][C:11]([CH3:16])([CH3:15])[N:10]([CH3:19])[C:9]1([CH3:18])[CH3:17])[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1Into a 100 ml-flask equipped with a thermometer, a cooling tube, a dropping funnel and a magnetic stirrer were added 3.7 g of 3-benzyl-2,2,6,6-tetramethyl-4-piperidinol prepared in Example A1 above, 30 ml of dioxane and 0.78 g of fumic acid, and the content in the flask was heated to 80° C. When the temperature of the content was at a constant level, 2.44 g of 37% aqueous formaldehyde in which 10 ml of dioxane had been dissolved was introduced gradually through the dropping funnel, and the content of the flask was heated at the same temperature under agitation for 8 hours. The temperature was then lowered to room temperature, 10% aqueous NaOH was added so that the pH became to 7, and the solution was subjected to extraction with 150 ml of diethylether. The extract obtained was washed three times with 30 ml of water, 10 g of magnesium sulfate and the solution was kept standing for 2 hours, and the solution was filtered and concentrated to give 3.3 g (yield: 83%) of the title compound as a white solid product.
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