Azobisisobutyronitrile → 4-Ethynylphenol

Participants

Reaction Conditions

Reaction Steps

In 120 ml of butyl acetate was dissolved 32.4 g (0.2 mol) of p-acetoxystyrene. Three 0.033 g portions of azobisisobutyronitrile (AIBN) were added at an interval of 2.5 hours to the solution with stirring at 80° C. in a nitrogen stream and stirring was thereafter continued for 5 hours, whereby polymerization reaction was conducted. The resultant reaction mixture was poured into 1,200 ml of hexane to precipitate a white resin. The resin obtained was dried and then dissolved in 150 ml of methanol. Thereto was added an aqueous solution prepared by dissolving 7.7 g (0.19 mol) of sodium hydroxide in 50 ml of water. This mixture was heated with refluxing for 3 hours to hydrolyze the resin. Thereafter, the reaction mixture was diluted with 200 ml of water and neutralized with hydrochloric acid to precipitate a white resin. This resin was taken out by filtration, washed with water, dried, and then dissolved in 200 ml of tetrahydrofuran to give a solution, which was added dropwise to 5 L of ultrapure water with vigorous agitation to conduct reprecipitation. This reprecipitation operation was repeated three times. The resin thus obtained was dried in a vacuum dryer at 120° C. for 12 hours to obtain poly(p-hydroxystyrene) as alkali-soluble resin A-1.

Provenance & Evidence