Reacción #518093

Ecuación de reacción

poly(p-hydroxystyrene)

3,4-dihydro-2H-pyrane

sulfuric acid

→

p-tetrahydropyranyloxystyrene p-hydroxystyrene

Disolventes

1,2-dimethoxyethane

Condiciones de reacción

Tratamiento posterior

1. 1
   Otroa reaction at 30 to 40° C. for 15 hours
2. 2
   OtroAfter the reaction
3. 3
   Concentraciónthe resultant was concentrated under reduced pressure
4. 4
   workup.ADDITIONpoured into 2000 ml of water
5. 5
   Otroto precipitate out
6. 6
   FiltraciónThe precipitated polymer was filtered
7. 7
   Lavadowashed with water
8. 8
   Otrodried under reduced pressure

Procedimiento

16.2 Grams of poly(p-hydroxystyrene) [Mw: about 15000, Mw/Mn: 1.14 (GPC method: polystyrene as standard); Nippon Soda Co., Ltd.] was dissolved in 180 ml of 1,2-dimethoxyethane, and 4.1 g of 3,4-dihydro-2H-pyrane and 0.7 ml of sulfuric acid were added thereto, followed by conducting a reaction at 30 to 40° C. for 15 hours with stirring. After the reaction, the resultant was concentrated under reduced pressure, and the residue was neutralized in sodium carbonate and poured into 2000 ml of water to precipitate out. The precipitated polymer was filtered, washed with water and dried under reduced pressure to give 18.0 g of poly(p-tetrahydropyranyloxystyrene/p-hydroxystyrene) as white powders. A ratio of p-tetrahydropyranyloxystyrene unit and p-hydroxystyrene unit of the obtained polymer was about 30:70 by 1HNMR. Mw: about 18000, Mw/Mn:1.14 (GPC method: polystyrene as standard).

Fuente