反应详情

温度

50 °C

Maleic anhydride (39.88 g), 0.407 mol) and allo-ocimene (55.34 g, 0.407 mol) were charged in a 250 ml three necked round-bottom flask, connected with a reflux condenser. Immediately after addition of the maleic anhydride to the allo-ocimene, the mixture turned intense orange/yellow. The mixture was warmed carefully to 50° C. Then, as the maleic anhydride started to melt, a violent and exothermic Diels-Alder reaction took place. The temperature rose rapidly to 170-190° C. while the color of the mixture became less intense. After about 10 minutes the temperature started to drop. The mixture was kept at 100° C. for one hour. 93.71 g (0.401 mol=98.4%) of a yellow product was obtained that solidified on standing (melting point 78-82° C.). The product was washed with pentane in order to remove the yellow color to a great extent. The yield dropped during washing to about 65%. The anhydride was recrystallized from heptane to yield a white solid (melting point 83.5° C.-84° C.). Yield after recrystallization was 60%).

1. customconnected with a reflux condenser
2. customa violent and exothermic Diels-Alder reaction
3. customrose rapidly to 170-190° C. while the color of the mixture
4. waitThe mixture was kept at 100° C. for one hour
5. custom93.71 g (0.401 mol=98.4%) of a yellow product was obtained that solidified
6. washThe product was washed with pentane in order
7. customto remove the yellow color to a great extent
8. additionThe yield dropped
9. washduring washing to about 65%
10. customThe anhydride was recrystallized from heptane