[OH:1][C:2]1[CH:9]=[CH:8][C:5]([CH:6]=[CH2:7])=[CH:4][CH:3]=1.[C:10]([O:17][C:18]([O:20][C:21]([CH3:24])([CH3:23])[CH3:22])=[O:19])(OC(C)(C)C)=O.O.Cl>N1C=CC=CC=1>[OH:1][C:2]1[CH:9]=[CH:8][C:5]([CH:6]=[CH2:7])=[CH:4][CH:3]=1.[C:21]([O:20][C:18]([O:17][C:10]1[CH:7]=[CH:6][C:5]([CH:8]=[CH2:9])=[CH:4][CH:3]=1)=[O:19])([CH3:22])([CH3:23])[CH3:24]Poly (p-hydroxystyrene) (VP-8000, manufactured by Nippon Soda Co., Ltd., weight average molecular weight: 11,000) was dissolved in 40 ml of pyridine, and 1.28 g of di-t-butyl dicarbonate was added to the solution with stirring at room temperature. After performing the reaction at room temperature for 3 hours, the reaction solution was poured into 1 liter of ion exchange water containing 20 g of concentrated hydrochloric acid. The powder precipitated was filtered, washed with water, and dried, thereby p-hydroxystyrene/p-(t-butyloxycarbonyloxy)styrene copolymer (60/40) was obtained.
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