反应详情

There was obtained a distillate containing 35.7 g of methacrylonitrile, besides methanol and water. The distillation residue was then mushed or slurried with water, filtered, washed with water to neutrality, and finally well squeezed. The solid product thus obtained, consisting of 3-(1-anthraquinonyl)-2-hydroxy-2-methylpropionitrile: ##STR9## is suspended, still humid, in a solution of 500 cc of methanol containing 25 g of potassium hydroxide. This suspension was then reflux-heated for 1.5 hours and the red tinged solution thus obtained was freed of the insoluble impurities by filtering. It was then diluted with water up to 1.5 liters and then acidified with concentrated hydrochloric acid. Thereby was formed a yellow tinged precipitate which was filtered, washed with water to neutrality, and finally dried at 100° C. under vacuum until attaining a constant weight. In this way there were obtained 44.8 g of 2-hydroxybenzanthrone in the form of a yellow powder.

1. customThere was obtained
2. filtrationfiltered
3. washwashed with water to neutrality
4. customThe solid product thus obtained
5. temperatureThis suspension was then reflux-heated for 1.5 hours
6. customthe red tinged solution thus obtained
7. filtrationby filtering
8. additionIt was then diluted with water up to 1.5 liters
9. customThereby was formed a yellow tinged precipitate which
10. filtrationwas filtered
11. washwashed with water to neutrality
12. customfinally dried at 100° C. under vacuum