反应详情

To a solution of poly(p-hydroxystyrene) (9.0 g) [MARUKA LYNCUR-M, manufactured by Maruzen Petrochemical Co., Ltd., Mw 10000 and Mn 5000] in dimethoxyethane (100 ml), 3,4-dihydro-2H-pyran (12.6 g) and conc. sulfuric acid (0.5 ml) were added, followed by reaction at 30°-40° C. for 15 hours with stirring. After reaction, the mixture was evaporated in vacuo, the residue was neutralized by addition of sodium carbonate and poured into H2O (1 liter). The precipitate was filtered by suction, washed with H2O and dried under reduced pressure to give 11.0 g of the title compound as a white powder having Mw 10000 (GPC with polystyrene calibration). The composition of the polymer was found to be p-tetrahydropyranyloxystyrene unit and p-hydroxystyrene unit in a molar ratio of ca. 3:7 based on 1HNMR.

1. customfollowed by reaction at 30°-40° C. for 15 hours
2. customAfter reaction
3. customthe mixture was evaporated in vacuo
4. additionthe residue was neutralized by addition of sodium carbonate
5. additionpoured into H2O (1 liter)
6. filtrationThe precipitate was filtered by suction
7. washwashed with H2O
8. customdried under reduced pressure