Реакция #2770

Уравнение реакции

sodium carbonate

3,4-dihydro-2H-pyran

sulfuric acid

Poly(p-hydroxystyrene)

→

p-tetrahydropyranyloxystyrene p-hydroxystyrene

Растворители

water

dimethoxyethane

Условия реакции

Обработка

1. 1
   Концентрированиеthe reaction solution was concentrated under reduced pressure
2. 2
   ДругоеThe residue obtained
3. 3
   Другоеto precipitate crystals
4. 4
   ФильтрацияThe crystals were filtered off
5. 5
   Промывкаwashed with water
6. 6
   Другоеdried under reduced pressure

Методика

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.

Источник