反应详情

To a 500 mL flask, equipped with mechanical stirrer and under inert atmosphere, was added Oxacycloundecane-2,11-dione (20 g, 108.5 mmol), phenol (10.22 g, 108.5 mmol), and 200 mL carbon disulfide. Aluminum (III) trichloride (72.34 g, 542 mmol) was added and the reaction was stirred for 72 hours. Carbon disulfide was decanted away, and ice was carefully added until most of mixture was dissolved. The insoluble material was collect by suction filtration and washed with 2×100 mL of water. The solid was then dissolved in 100 mL of 1 M aqueous sodium hydroxide and then carefully acidified with 1 M aqueous hydrochloric acid until pH=7.5 The solids that formed were removed by filtration and the parent solution was continued to be acidified until pH 2.5. The crude product precipitate was collected by filtration and was washed with 1×100 mL water. The crude product was dissolved in 100 mL of 1 M aqueous sodium hydroxide and then carefully acidified with 1 M aqueous hydrochloric acid until pH=7.5 and the impurities that precipitated were filtered off. The parent solution was further acidified until pH 2. The crude product was collected by filtration and washed with 2×50 mL water. The product was recrystallized form acetone. The isolated product (1.2 g, 4%) was collected by filtration. Found: C, 69.00; H, 7.81%; C16H22O4 requires C, 69.04; H, 7.97%; 1H NMR (d6-DMSO): δ 12.0, bs, 1H (COOH); δ 10.3, bs, 1H (aryl-hydroxyl); δ 7.8 d, 2H (aryl H's); δ 6.8, d, 2H, (aryl H's); δ 2.9, t, 2H (CH2 α to carbonyl); δ 2.2, t, 2H (CH2 α to COOH); δ 1.5, multiplet, 4H (CH2's β to carbonyl & β to COOH), δ 1.3, multiplet, 8H (rest of CH2's).

1. customTo a 500 mL flask, equipped with mechanical stirrer and under inert atmosphere
2. customCarbon disulfide was decanted away
3. additionice was carefully added until most of mixture
4. dissolutionwas dissolved
5. filtrationThe insoluble material was collect by suction filtration
6. washwashed with 2×100 mL of water
7. dissolutionThe solid was then dissolved in 100 mL of 1 M aqueous sodium hydroxide
8. customthat formed
9. customwere removed by filtration
10. filtrationThe crude product precipitate was collected by filtration
11. washwas washed with 1×100 mL water
12. dissolutionThe crude product was dissolved in 100 mL of 1 M aqueous sodium hydroxide
13. customthe impurities that precipitated
14. filtrationwere filtered off
15. filtrationThe crude product was collected by filtration
16. washwashed with 2×50 mL water
17. customThe product was recrystallized form acetone
18. filtrationThe isolated product (1.2 g, 4%) was collected by filtration