反应详情

温度

90 °C

Cis,cis-Muconic acid (100 g) is dissolved in water (1 L, then adjusted to pH 6 by adding base, sodium hydroxide) and the mixture is heated at 90° C. for 3.5 hours. Samples are taken every 30 minutes and analyzed by HPLC. HPLC analyses of these samples show that the isomerization process is almost complete after 1 hour of heating at 90° C. After 3.5 hours of heating at 90° C., the mixture is treated with charcoal (10 g) for 30 minutes and filtered through a Whatman filter paper (#2). The pH of the solution is adjusted to 3.5 by adding base, sodium hydroxide. The precipitate is obtained by filtration, washed with ice-cold water (200 mL), and dried under reduced pressure to yield 64.5 g (65 percent yield) of light yellow cis,trans-muconic acid.

1. waitis almost complete after 1 hour
2. temperatureof heating at 90° C
3. temperatureAfter 3.5 hours of heating at 90° C.
4. filtrationfiltered through a Whatman
5. filtrationfilter paper (#2)
6. additionby adding base, sodium hydroxide
7. customThe precipitate is obtained by filtration
8. washwashed with ice-cold water (200 mL)
9. customdried under reduced pressure