反応 #2770

反応方程式

sodium carbonate

3,4-dihydro-2H-pyran

sulfuric acid

Poly(p-hydroxystyrene)

→

p-tetrahydropyranyloxystyrene p-hydroxystyrene

溶媒

water

dimethoxyethane

反応条件

後処理

1. 1
   濃縮the reaction solution was concentrated under reduced pressure
2. 2
   その他The residue obtained
3. 3
   その他to precipitate crystals
4. 4
   ろ過The crystals were filtered off
5. 5
   洗浄washed with water
6. 6
   その他dried under reduced pressure

実験手順

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.

出典