反应 #2770

反应方程式

sodium carbonate

3,4-dihydro-2H-pyran

sulfuric acid

Poly(p-hydroxystyrene)

→

p-tetrahydropyranyloxystyrene p-hydroxystyrene

溶剂

water

dimethoxyethane

反应条件

后处理

1. 1
   浓缩the reaction solution was concentrated under reduced pressure
2. 2
   其他The residue obtained
3. 3
   其他to precipitate crystals
4. 4
   过滤The crystals were filtered off
5. 5
   洗涤washed with water
6. 6
   其他dried under reduced pressure

实验过程

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.

来源