反应详情

A 2000 mL, 1 neck round-bottomed flask containing a magnetic stir bar is charged with 2,4-dihydroxybenzophenone (85.6 g, 0.40 mol, Aldrich Chemical Co., Milwaukee, Wis.). To this is added a solution of sodium hydroxide (16.0 g) dissolved in 320 mL of water. Next, 1,2-dibromoethane (105.6 g, 0.56 mol) dissolved in 320 ml of ethanol is added. The reaction mixture is heated to reflux with stirring for 16 hours. The reaction vessel is then transferred to a rotary evaporator where the liquids are removed at aspirator pressure at 80° C. A brown solid is obtained which is suspended in 180 mL of acetone and stirred for 1 hour at 45° C. This mixture is filtered and the filtrate poured into 2 L of water containing 20 g of sodium carbonate yielding 65 grams of a tan precipitate. This material is recrystallized from approximately 100 mL of ethanol to give 55.3 g (0.17 mol, 43%) of a light tan solid m.p. 87°-89.5° C.

1. additionA 2000 mL, 1 neck round-bottomed flask containing a magnetic stir bar
2. additionis added
3. temperatureThe reaction mixture is heated
4. temperatureto reflux
5. customThe reaction vessel is then transferred to a rotary evaporator where the liquids
6. customare removed at aspirator pressure at 80° C
7. customA brown solid is obtained which
8. stirringstirred for 1 hour at 45° C
9. filtrationThis mixture is filtered
10. additionthe filtrate poured into 2 L of water containing 20 g of sodium carbonate yielding 65 grams of a tan precipitate
11. customThis material is recrystallized from approximately 100 mL of ethanol