Hydrochloric Acid → 4-Ethynylphenol

Participants

Reaction Conditions

Reaction Steps

32.4 g (0.2 mols) of p-acetoxystyrene was dissolved in 120 ml of butyl acetate. To the solution was then added 0.033 g of azobisisobutylonitrile (AIBN) with stirring in a stream of nitrogen at a temperature of 80° C. every 2.5 hours three times in all. Thereafter, the mixture was stirred for 5 hours to undergo polymerization reaction. The reaction solution was then poured into 1,200 ml of hexane to cause the precipitation of a white resin. The resin thus obtained was dried, and then dissolved in 150 ml of methanol. To the solution was added a solution of 7.7 g (0.19 mols) of sodium hydroxide in 50 ml of water. The reaction solution was then heated under reflux for 3 hours to undergo hydrolysis. Thereafter, the reaction solution was diluted with 200 ml of water, and then neutralized with hydrochloric acid to cause the precipitation of a white resin. The resin thus obtained was collected by filtration, washed with water, and dried. The resin thus obtained was dissolved in 200 ml of tetrahydrofuran, and added dropwise to 5 liters of ultrapure water with vigorous stirring to reprecipitate. The reprecipitation procedure was then repeated three times. The resin thus obtained was dried at a temperature of 120° C. in a vacuum drier for 12 hours to obtain a poly(p-hydroxystyrene) type alkali-soluble resin R-1.

Provenance & Evidence