反应详情

A solution of 25.0 g (379 mmol) 85% KOH in 300 ml water is added to 40.0 g (74.3 mmol) diethyl-2,5-bis-(6-acetoxyhexoxy)terephthalate in 250 ml ethanol and the whole is heated under reflux for 1.5 hours. After distilling off approx. 150 ml ethanol, the reaction mixture is acidified by adding 40.0 g conc. HCl and stored at 2° C. for 20 hours for complete crystallization of the crude product. The colourless crude product is then filtered off, washed neutral with water and recrystallized from ethanol.

1. temperaturethe whole is heated
2. temperatureunder reflux for 1.5 hours
3. distillationAfter distilling off approx. 150 ml ethanol
4. additionby adding 40.0 g conc. HCl
5. customstored at 2° C. for 20 hours for complete crystallization of the crude product
6. filtrationThe colourless crude product is then filtered off
7. washwashed neutral with water
8. customrecrystallized from ethanol