反应详情

温度

45 °C

A reaction mixture of 100 g (0.65 mol) of 2,5-dihydroxyacetophenone in 1 l of acetonitrile, 130 ml (1.55 mol) of pyrrolidine and 290 ml (3.95 mol) of acetone was heated to 45° C. for 8 h. The solvents were then stripped off in vac. and the residue was dissolved in 1 l of EA. The organic phase was washed twice with dilute hydrochloric acid, stirred with activated carbon and dried over magnesium sulfate and largely concentrated. After stirring the residue with petroleum ether and filtering off the precipitate with suction, 102 g of 2,2-dimethyl-6-hydroxychroman-4-one, m.p. 158° C., were obtained.

1. washThe organic phase was washed twice with dilute hydrochloric acid
2. dry with materialdried over magnesium sulfate
3. concentrationlargely concentrated
4. stirringAfter stirring the residue with petroleum ether
5. filtrationfiltering off the precipitate with suction, 102 g of 2,2-dimethyl-6-hydroxychroman-4-one, m.p. 158° C.
6. customwere obtained