반응 #2770

반응 방정식

sodium carbonate

3,4-dihydro-2H-pyran

sulfuric acid

Poly(p-hydroxystyrene)

→

p-tetrahydropyranyloxystyrene p-hydroxystyrene

용매

water

dimethoxyethane

반응 조건

후처리

1. 1
   농축the reaction solution was concentrated under reduced pressure
2. 2
   기타The residue obtained
3. 3
   기타to precipitate crystals
4. 4
   여과The crystals were filtered off
5. 5
   세척washed with water
6. 6
   기타dried under reduced pressure

실험 절차

Poly(p-hydroxystyrene) (weight average molecular weight: 9,600) in an amount of 9 g was dissolved in 100 ml of dimethoxyethane, and thereto 12.6 g of 3,4-dihydro-2H-pyran and 0.5 ml of sulfuric acid were added. This solution was stirred for 15 hours at 30°-40° C. After the reaction was completed, the reaction solution was concentrated under reduced pressure. The residue obtained was neutralized with sodium carbonate, and then poured into water to precipitate crystals. The crystals were filtered off, washed with water and dried under reduced pressure. Thus, 11.0 g of poly(p-tetrahydropyranyloxystyrene-p-hydroxystyrene) was obtained as white powder. The ratio of the p-tetrahydropyranyloxystyrene units to the p-hydroxystyrene units in the polymer obtained was determined to be 3:7 by 1H-NMR analysis.

출처